1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "qemu/osdep.h" 34 #include "sysemu/block-backend.h" 35 #include "sysemu/blockdev.h" 36 #include "hw/block/block.h" 37 #include "block/blockjob.h" 38 #include "block/qdict.h" 39 #include "block/throttle-groups.h" 40 #include "monitor/monitor.h" 41 #include "qemu/error-report.h" 42 #include "qemu/option.h" 43 #include "qemu/config-file.h" 44 #include "qapi/qapi-commands-block.h" 45 #include "qapi/qapi-commands-transaction.h" 46 #include "qapi/qapi-visit-block-core.h" 47 #include "qapi/qmp/qdict.h" 48 #include "qapi/qmp/qnum.h" 49 #include "qapi/qmp/qstring.h" 50 #include "qapi/error.h" 51 #include "qapi/qmp/qerror.h" 52 #include "qapi/qmp/qlist.h" 53 #include "qapi/qobject-output-visitor.h" 54 #include "sysemu/sysemu.h" 55 #include "sysemu/iothread.h" 56 #include "block/block_int.h" 57 #include "block/trace.h" 58 #include "sysemu/arch_init.h" 59 #include "sysemu/qtest.h" 60 #include "qemu/cutils.h" 61 #include "qemu/help_option.h" 62 #include "qemu/throttle-options.h" 63 64 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 66 67 static int do_open_tray(const char *blk_name, const char *qdev_id, 68 bool force, Error **errp); 69 static void blockdev_remove_medium(bool has_device, const char *device, 70 bool has_id, const char *id, Error **errp); 71 static void blockdev_insert_medium(bool has_device, const char *device, 72 bool has_id, const char *id, 73 const char *node_name, Error **errp); 74 75 static const char *const if_name[IF_COUNT] = { 76 [IF_NONE] = "none", 77 [IF_IDE] = "ide", 78 [IF_SCSI] = "scsi", 79 [IF_FLOPPY] = "floppy", 80 [IF_PFLASH] = "pflash", 81 [IF_MTD] = "mtd", 82 [IF_SD] = "sd", 83 [IF_VIRTIO] = "virtio", 84 [IF_XEN] = "xen", 85 }; 86 87 static int if_max_devs[IF_COUNT] = { 88 /* 89 * Do not change these numbers! They govern how drive option 90 * index maps to unit and bus. That mapping is ABI. 91 * 92 * All controllers used to implement if=T drives need to support 93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 94 * Otherwise, some index values map to "impossible" bus, unit 95 * values. 96 * 97 * For instance, if you change [IF_SCSI] to 255, -drive 98 * if=scsi,index=12 no longer means bus=1,unit=5, but 99 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 100 * the drive can't be set up. Regression. 101 */ 102 [IF_IDE] = 2, 103 [IF_SCSI] = 7, 104 }; 105 106 /** 107 * Boards may call this to offer board-by-board overrides 108 * of the default, global values. 109 */ 110 void override_max_devs(BlockInterfaceType type, int max_devs) 111 { 112 BlockBackend *blk; 113 DriveInfo *dinfo; 114 115 if (max_devs <= 0) { 116 return; 117 } 118 119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 120 dinfo = blk_legacy_dinfo(blk); 121 if (dinfo->type == type) { 122 fprintf(stderr, "Cannot override units-per-bus property of" 123 " the %s interface, because a drive of that type has" 124 " already been added.\n", if_name[type]); 125 g_assert_not_reached(); 126 } 127 } 128 129 if_max_devs[type] = max_devs; 130 } 131 132 /* 133 * We automatically delete the drive when a device using it gets 134 * unplugged. Questionable feature, but we can't just drop it. 135 * Device models call blockdev_mark_auto_del() to schedule the 136 * automatic deletion, and generic qdev code calls blockdev_auto_del() 137 * when deletion is actually safe. 138 */ 139 void blockdev_mark_auto_del(BlockBackend *blk) 140 { 141 DriveInfo *dinfo = blk_legacy_dinfo(blk); 142 BlockDriverState *bs = blk_bs(blk); 143 AioContext *aio_context; 144 145 if (!dinfo) { 146 return; 147 } 148 149 if (bs) { 150 aio_context = bdrv_get_aio_context(bs); 151 aio_context_acquire(aio_context); 152 153 if (bs->job) { 154 job_cancel(&bs->job->job, false); 155 } 156 157 aio_context_release(aio_context); 158 } 159 160 dinfo->auto_del = 1; 161 } 162 163 void blockdev_auto_del(BlockBackend *blk) 164 { 165 DriveInfo *dinfo = blk_legacy_dinfo(blk); 166 167 if (dinfo && dinfo->auto_del) { 168 monitor_remove_blk(blk); 169 blk_unref(blk); 170 } 171 } 172 173 /** 174 * Returns the current mapping of how many units per bus 175 * a particular interface can support. 176 * 177 * A positive integer indicates n units per bus. 178 * 0 implies the mapping has not been established. 179 * -1 indicates an invalid BlockInterfaceType was given. 180 */ 181 int drive_get_max_devs(BlockInterfaceType type) 182 { 183 if (type >= IF_IDE && type < IF_COUNT) { 184 return if_max_devs[type]; 185 } 186 187 return -1; 188 } 189 190 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 191 { 192 int max_devs = if_max_devs[type]; 193 return max_devs ? index / max_devs : 0; 194 } 195 196 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 197 { 198 int max_devs = if_max_devs[type]; 199 return max_devs ? index % max_devs : index; 200 } 201 202 QemuOpts *drive_def(const char *optstr) 203 { 204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 205 } 206 207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 208 const char *optstr) 209 { 210 QemuOpts *opts; 211 212 opts = drive_def(optstr); 213 if (!opts) { 214 return NULL; 215 } 216 if (type != IF_DEFAULT) { 217 qemu_opt_set(opts, "if", if_name[type], &error_abort); 218 } 219 if (index >= 0) { 220 qemu_opt_set_number(opts, "index", index, &error_abort); 221 } 222 if (file) 223 qemu_opt_set(opts, "file", file, &error_abort); 224 return opts; 225 } 226 227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 228 { 229 BlockBackend *blk; 230 DriveInfo *dinfo; 231 232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 233 dinfo = blk_legacy_dinfo(blk); 234 if (dinfo && dinfo->type == type 235 && dinfo->bus == bus && dinfo->unit == unit) { 236 return dinfo; 237 } 238 } 239 240 return NULL; 241 } 242 243 void drive_check_orphaned(void) 244 { 245 BlockBackend *blk; 246 DriveInfo *dinfo; 247 Location loc; 248 bool orphans = false; 249 250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 251 dinfo = blk_legacy_dinfo(blk); 252 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 253 dinfo->type != IF_NONE) { 254 loc_push_none(&loc); 255 qemu_opts_loc_restore(dinfo->opts); 256 error_report("machine type does not support" 257 " if=%s,bus=%d,unit=%d", 258 if_name[dinfo->type], dinfo->bus, dinfo->unit); 259 loc_pop(&loc); 260 orphans = true; 261 } 262 } 263 264 if (orphans) { 265 exit(1); 266 } 267 } 268 269 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 270 { 271 return drive_get(type, 272 drive_index_to_bus_id(type, index), 273 drive_index_to_unit_id(type, index)); 274 } 275 276 int drive_get_max_bus(BlockInterfaceType type) 277 { 278 int max_bus; 279 BlockBackend *blk; 280 DriveInfo *dinfo; 281 282 max_bus = -1; 283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 284 dinfo = blk_legacy_dinfo(blk); 285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 286 max_bus = dinfo->bus; 287 } 288 } 289 return max_bus; 290 } 291 292 /* Get a block device. This should only be used for single-drive devices 293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 294 appropriate bus. */ 295 DriveInfo *drive_get_next(BlockInterfaceType type) 296 { 297 static int next_block_unit[IF_COUNT]; 298 299 return drive_get(type, 0, next_block_unit[type]++); 300 } 301 302 static void bdrv_format_print(void *opaque, const char *name) 303 { 304 error_printf(" %s", name); 305 } 306 307 typedef struct { 308 QEMUBH *bh; 309 BlockDriverState *bs; 310 } BDRVPutRefBH; 311 312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 313 { 314 if (!strcmp(buf, "ignore")) { 315 return BLOCKDEV_ON_ERROR_IGNORE; 316 } else if (!is_read && !strcmp(buf, "enospc")) { 317 return BLOCKDEV_ON_ERROR_ENOSPC; 318 } else if (!strcmp(buf, "stop")) { 319 return BLOCKDEV_ON_ERROR_STOP; 320 } else if (!strcmp(buf, "report")) { 321 return BLOCKDEV_ON_ERROR_REPORT; 322 } else { 323 error_setg(errp, "'%s' invalid %s error action", 324 buf, is_read ? "read" : "write"); 325 return -1; 326 } 327 } 328 329 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 330 Error **errp) 331 { 332 const QListEntry *entry; 333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 334 switch (qobject_type(entry->value)) { 335 336 case QTYPE_QSTRING: { 337 unsigned long long length; 338 const char *str = qstring_get_str(qobject_to(QString, 339 entry->value)); 340 if (parse_uint_full(str, &length, 10) == 0 && 341 length > 0 && length <= UINT_MAX) { 342 block_acct_add_interval(stats, (unsigned) length); 343 } else { 344 error_setg(errp, "Invalid interval length: %s", str); 345 return false; 346 } 347 break; 348 } 349 350 case QTYPE_QNUM: { 351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 352 353 if (length > 0 && length <= UINT_MAX) { 354 block_acct_add_interval(stats, (unsigned) length); 355 } else { 356 error_setg(errp, "Invalid interval length: %" PRId64, length); 357 return false; 358 } 359 break; 360 } 361 362 default: 363 error_setg(errp, "The specification of stats-intervals is invalid"); 364 return false; 365 } 366 } 367 return true; 368 } 369 370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 371 372 /* All parameters but @opts are optional and may be set to NULL. */ 373 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 374 const char **throttling_group, ThrottleConfig *throttle_cfg, 375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 376 { 377 Error *local_error = NULL; 378 const char *aio; 379 380 if (bdrv_flags) { 381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 382 *bdrv_flags |= BDRV_O_COPY_ON_READ; 383 } 384 385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 386 if (!strcmp(aio, "native")) { 387 *bdrv_flags |= BDRV_O_NATIVE_AIO; 388 } else if (!strcmp(aio, "threads")) { 389 /* this is the default */ 390 } else { 391 error_setg(errp, "invalid aio option"); 392 return; 393 } 394 } 395 } 396 397 /* disk I/O throttling */ 398 if (throttling_group) { 399 *throttling_group = qemu_opt_get(opts, "throttling.group"); 400 } 401 402 if (throttle_cfg) { 403 throttle_config_init(throttle_cfg); 404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 405 qemu_opt_get_number(opts, "throttling.bps-total", 0); 406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 407 qemu_opt_get_number(opts, "throttling.bps-read", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 409 qemu_opt_get_number(opts, "throttling.bps-write", 0); 410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 411 qemu_opt_get_number(opts, "throttling.iops-total", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 413 qemu_opt_get_number(opts, "throttling.iops-read", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 415 qemu_opt_get_number(opts, "throttling.iops-write", 0); 416 417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 419 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 425 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 429 430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 442 443 throttle_cfg->op_size = 444 qemu_opt_get_number(opts, "throttling.iops-size", 0); 445 446 if (!throttle_is_valid(throttle_cfg, errp)) { 447 return; 448 } 449 } 450 451 if (detect_zeroes) { 452 *detect_zeroes = 453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 454 qemu_opt_get(opts, "detect-zeroes"), 455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 456 &local_error); 457 if (local_error) { 458 error_propagate(errp, local_error); 459 return; 460 } 461 } 462 } 463 464 /* Takes the ownership of bs_opts */ 465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 466 Error **errp) 467 { 468 const char *buf; 469 int bdrv_flags = 0; 470 int on_read_error, on_write_error; 471 bool account_invalid, account_failed; 472 bool writethrough, read_only; 473 BlockBackend *blk; 474 BlockDriverState *bs; 475 ThrottleConfig cfg; 476 int snapshot = 0; 477 Error *error = NULL; 478 QemuOpts *opts; 479 QDict *interval_dict = NULL; 480 QList *interval_list = NULL; 481 const char *id; 482 BlockdevDetectZeroesOptions detect_zeroes = 483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 484 const char *throttling_group = NULL; 485 486 /* Check common options by copying from bs_opts to opts, all other options 487 * stay in bs_opts for processing by bdrv_open(). */ 488 id = qdict_get_try_str(bs_opts, "id"); 489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 490 if (error) { 491 error_propagate(errp, error); 492 goto err_no_opts; 493 } 494 495 qemu_opts_absorb_qdict(opts, bs_opts, &error); 496 if (error) { 497 error_propagate(errp, error); 498 goto early_err; 499 } 500 501 if (id) { 502 qdict_del(bs_opts, "id"); 503 } 504 505 /* extract parameters */ 506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 507 508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 510 511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 512 513 id = qemu_opts_id(opts); 514 515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 516 qdict_array_split(interval_dict, &interval_list); 517 518 if (qdict_size(interval_dict) != 0) { 519 error_setg(errp, "Invalid option stats-intervals.%s", 520 qdict_first(interval_dict)->key); 521 goto early_err; 522 } 523 524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 525 &detect_zeroes, &error); 526 if (error) { 527 error_propagate(errp, error); 528 goto early_err; 529 } 530 531 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 532 if (is_help_option(buf)) { 533 error_printf("Supported formats:"); 534 bdrv_iterate_format(bdrv_format_print, NULL); 535 error_printf("\n"); 536 goto early_err; 537 } 538 539 if (qdict_haskey(bs_opts, "driver")) { 540 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 541 goto early_err; 542 } 543 qdict_put_str(bs_opts, "driver", buf); 544 } 545 546 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 547 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 548 on_write_error = parse_block_error_action(buf, 0, &error); 549 if (error) { 550 error_propagate(errp, error); 551 goto early_err; 552 } 553 } 554 555 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 556 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 557 on_read_error = parse_block_error_action(buf, 1, &error); 558 if (error) { 559 error_propagate(errp, error); 560 goto early_err; 561 } 562 } 563 564 if (snapshot) { 565 bdrv_flags |= BDRV_O_SNAPSHOT; 566 } 567 568 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 569 570 /* init */ 571 if ((!file || !*file) && !qdict_size(bs_opts)) { 572 BlockBackendRootState *blk_rs; 573 574 blk = blk_new(0, BLK_PERM_ALL); 575 blk_rs = blk_get_root_state(blk); 576 blk_rs->open_flags = bdrv_flags; 577 blk_rs->read_only = read_only; 578 blk_rs->detect_zeroes = detect_zeroes; 579 580 qobject_unref(bs_opts); 581 } else { 582 if (file && !*file) { 583 file = NULL; 584 } 585 586 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 587 * with other callers) rather than what we want as the real defaults. 588 * Apply the defaults here instead. */ 589 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 590 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 591 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 592 read_only ? "on" : "off"); 593 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 594 595 if (runstate_check(RUN_STATE_INMIGRATE)) { 596 bdrv_flags |= BDRV_O_INACTIVE; 597 } 598 599 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 600 if (!blk) { 601 goto err_no_bs_opts; 602 } 603 bs = blk_bs(blk); 604 605 bs->detect_zeroes = detect_zeroes; 606 607 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 608 609 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 610 blk_unref(blk); 611 blk = NULL; 612 goto err_no_bs_opts; 613 } 614 } 615 616 /* disk I/O throttling */ 617 if (throttle_enabled(&cfg)) { 618 if (!throttling_group) { 619 throttling_group = id; 620 } 621 blk_io_limits_enable(blk, throttling_group); 622 blk_set_io_limits(blk, &cfg); 623 } 624 625 blk_set_enable_write_cache(blk, !writethrough); 626 blk_set_on_error(blk, on_read_error, on_write_error); 627 628 if (!monitor_add_blk(blk, id, errp)) { 629 blk_unref(blk); 630 blk = NULL; 631 goto err_no_bs_opts; 632 } 633 634 err_no_bs_opts: 635 qemu_opts_del(opts); 636 qobject_unref(interval_dict); 637 qobject_unref(interval_list); 638 return blk; 639 640 early_err: 641 qemu_opts_del(opts); 642 qobject_unref(interval_dict); 643 qobject_unref(interval_list); 644 err_no_opts: 645 qobject_unref(bs_opts); 646 return NULL; 647 } 648 649 /* Takes the ownership of bs_opts */ 650 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 651 { 652 int bdrv_flags = 0; 653 654 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 655 * with other callers) rather than what we want as the real defaults. 656 * Apply the defaults here instead. */ 657 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 658 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 659 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 660 661 if (runstate_check(RUN_STATE_INMIGRATE)) { 662 bdrv_flags |= BDRV_O_INACTIVE; 663 } 664 665 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 666 } 667 668 void blockdev_close_all_bdrv_states(void) 669 { 670 BlockDriverState *bs, *next_bs; 671 672 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 673 AioContext *ctx = bdrv_get_aio_context(bs); 674 675 aio_context_acquire(ctx); 676 bdrv_unref(bs); 677 aio_context_release(ctx); 678 } 679 } 680 681 /* Iterates over the list of monitor-owned BlockDriverStates */ 682 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 683 { 684 return bs ? QTAILQ_NEXT(bs, monitor_list) 685 : QTAILQ_FIRST(&monitor_bdrv_states); 686 } 687 688 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 689 Error **errp) 690 { 691 const char *value; 692 693 value = qemu_opt_get(opts, from); 694 if (value) { 695 if (qemu_opt_find(opts, to)) { 696 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 697 "same time", to, from); 698 return; 699 } 700 } 701 702 /* rename all items in opts */ 703 while ((value = qemu_opt_get(opts, from))) { 704 qemu_opt_set(opts, to, value, &error_abort); 705 qemu_opt_unset(opts, from); 706 } 707 } 708 709 QemuOptsList qemu_legacy_drive_opts = { 710 .name = "drive", 711 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 712 .desc = { 713 { 714 .name = "bus", 715 .type = QEMU_OPT_NUMBER, 716 .help = "bus number", 717 },{ 718 .name = "unit", 719 .type = QEMU_OPT_NUMBER, 720 .help = "unit number (i.e. lun for scsi)", 721 },{ 722 .name = "index", 723 .type = QEMU_OPT_NUMBER, 724 .help = "index number", 725 },{ 726 .name = "media", 727 .type = QEMU_OPT_STRING, 728 .help = "media type (disk, cdrom)", 729 },{ 730 .name = "if", 731 .type = QEMU_OPT_STRING, 732 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 733 },{ 734 .name = "file", 735 .type = QEMU_OPT_STRING, 736 .help = "file name", 737 }, 738 739 /* Options that are passed on, but have special semantics with -drive */ 740 { 741 .name = BDRV_OPT_READ_ONLY, 742 .type = QEMU_OPT_BOOL, 743 .help = "open drive file as read-only", 744 },{ 745 .name = "rerror", 746 .type = QEMU_OPT_STRING, 747 .help = "read error action", 748 },{ 749 .name = "werror", 750 .type = QEMU_OPT_STRING, 751 .help = "write error action", 752 },{ 753 .name = "copy-on-read", 754 .type = QEMU_OPT_BOOL, 755 .help = "copy read data from backing file into image file", 756 }, 757 758 { /* end of list */ } 759 }, 760 }; 761 762 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 763 { 764 const char *value; 765 BlockBackend *blk; 766 DriveInfo *dinfo = NULL; 767 QDict *bs_opts; 768 QemuOpts *legacy_opts; 769 DriveMediaType media = MEDIA_DISK; 770 BlockInterfaceType type; 771 int max_devs, bus_id, unit_id, index; 772 const char *werror, *rerror; 773 bool read_only = false; 774 bool copy_on_read; 775 const char *filename; 776 Error *local_err = NULL; 777 int i; 778 779 /* Change legacy command line options into QMP ones */ 780 static const struct { 781 const char *from; 782 const char *to; 783 } opt_renames[] = { 784 { "iops", "throttling.iops-total" }, 785 { "iops_rd", "throttling.iops-read" }, 786 { "iops_wr", "throttling.iops-write" }, 787 788 { "bps", "throttling.bps-total" }, 789 { "bps_rd", "throttling.bps-read" }, 790 { "bps_wr", "throttling.bps-write" }, 791 792 { "iops_max", "throttling.iops-total-max" }, 793 { "iops_rd_max", "throttling.iops-read-max" }, 794 { "iops_wr_max", "throttling.iops-write-max" }, 795 796 { "bps_max", "throttling.bps-total-max" }, 797 { "bps_rd_max", "throttling.bps-read-max" }, 798 { "bps_wr_max", "throttling.bps-write-max" }, 799 800 { "iops_size", "throttling.iops-size" }, 801 802 { "group", "throttling.group" }, 803 804 { "readonly", BDRV_OPT_READ_ONLY }, 805 }; 806 807 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 808 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 809 &local_err); 810 if (local_err) { 811 error_report_err(local_err); 812 return NULL; 813 } 814 } 815 816 value = qemu_opt_get(all_opts, "cache"); 817 if (value) { 818 int flags = 0; 819 bool writethrough; 820 821 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 822 error_report("invalid cache option"); 823 return NULL; 824 } 825 826 /* Specific options take precedence */ 827 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 828 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 829 !writethrough, &error_abort); 830 } 831 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 832 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 833 !!(flags & BDRV_O_NOCACHE), &error_abort); 834 } 835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 837 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 838 } 839 qemu_opt_unset(all_opts, "cache"); 840 } 841 842 /* Get a QDict for processing the options */ 843 bs_opts = qdict_new(); 844 qemu_opts_to_qdict(all_opts, bs_opts); 845 846 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 847 &error_abort); 848 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 849 if (local_err) { 850 error_report_err(local_err); 851 goto fail; 852 } 853 854 /* Media type */ 855 value = qemu_opt_get(legacy_opts, "media"); 856 if (value) { 857 if (!strcmp(value, "disk")) { 858 media = MEDIA_DISK; 859 } else if (!strcmp(value, "cdrom")) { 860 media = MEDIA_CDROM; 861 read_only = true; 862 } else { 863 error_report("'%s' invalid media", value); 864 goto fail; 865 } 866 } 867 868 /* copy-on-read is disabled with a warning for read-only devices */ 869 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 870 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 871 872 if (read_only && copy_on_read) { 873 warn_report("disabling copy-on-read on read-only drive"); 874 copy_on_read = false; 875 } 876 877 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 878 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 879 880 /* Controller type */ 881 value = qemu_opt_get(legacy_opts, "if"); 882 if (value) { 883 for (type = 0; 884 type < IF_COUNT && strcmp(value, if_name[type]); 885 type++) { 886 } 887 if (type == IF_COUNT) { 888 error_report("unsupported bus type '%s'", value); 889 goto fail; 890 } 891 } else { 892 type = block_default_type; 893 } 894 895 /* Device address specified by bus/unit or index. 896 * If none was specified, try to find the first free one. */ 897 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 898 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 899 index = qemu_opt_get_number(legacy_opts, "index", -1); 900 901 max_devs = if_max_devs[type]; 902 903 if (index != -1) { 904 if (bus_id != 0 || unit_id != -1) { 905 error_report("index cannot be used with bus and unit"); 906 goto fail; 907 } 908 bus_id = drive_index_to_bus_id(type, index); 909 unit_id = drive_index_to_unit_id(type, index); 910 } 911 912 if (unit_id == -1) { 913 unit_id = 0; 914 while (drive_get(type, bus_id, unit_id) != NULL) { 915 unit_id++; 916 if (max_devs && unit_id >= max_devs) { 917 unit_id -= max_devs; 918 bus_id++; 919 } 920 } 921 } 922 923 if (max_devs && unit_id >= max_devs) { 924 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 925 goto fail; 926 } 927 928 if (drive_get(type, bus_id, unit_id) != NULL) { 929 error_report("drive with bus=%d, unit=%d (index=%d) exists", 930 bus_id, unit_id, index); 931 goto fail; 932 } 933 934 /* no id supplied -> create one */ 935 if (qemu_opts_id(all_opts) == NULL) { 936 char *new_id; 937 const char *mediastr = ""; 938 if (type == IF_IDE || type == IF_SCSI) { 939 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 940 } 941 if (max_devs) { 942 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 943 mediastr, unit_id); 944 } else { 945 new_id = g_strdup_printf("%s%s%i", if_name[type], 946 mediastr, unit_id); 947 } 948 qdict_put_str(bs_opts, "id", new_id); 949 g_free(new_id); 950 } 951 952 /* Add virtio block device */ 953 if (type == IF_VIRTIO) { 954 QemuOpts *devopts; 955 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 956 &error_abort); 957 if (arch_type == QEMU_ARCH_S390X) { 958 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 959 } else { 960 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 961 } 962 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 963 &error_abort); 964 } 965 966 filename = qemu_opt_get(legacy_opts, "file"); 967 968 /* Check werror/rerror compatibility with if=... */ 969 werror = qemu_opt_get(legacy_opts, "werror"); 970 if (werror != NULL) { 971 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 972 type != IF_NONE) { 973 error_report("werror is not supported by this bus type"); 974 goto fail; 975 } 976 qdict_put_str(bs_opts, "werror", werror); 977 } 978 979 rerror = qemu_opt_get(legacy_opts, "rerror"); 980 if (rerror != NULL) { 981 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 982 type != IF_NONE) { 983 error_report("rerror is not supported by this bus type"); 984 goto fail; 985 } 986 qdict_put_str(bs_opts, "rerror", rerror); 987 } 988 989 /* Actual block device init: Functionality shared with blockdev-add */ 990 blk = blockdev_init(filename, bs_opts, &local_err); 991 bs_opts = NULL; 992 if (!blk) { 993 if (local_err) { 994 error_report_err(local_err); 995 } 996 goto fail; 997 } else { 998 assert(!local_err); 999 } 1000 1001 /* Create legacy DriveInfo */ 1002 dinfo = g_malloc0(sizeof(*dinfo)); 1003 dinfo->opts = all_opts; 1004 1005 dinfo->type = type; 1006 dinfo->bus = bus_id; 1007 dinfo->unit = unit_id; 1008 1009 blk_set_legacy_dinfo(blk, dinfo); 1010 1011 switch(type) { 1012 case IF_IDE: 1013 case IF_SCSI: 1014 case IF_XEN: 1015 case IF_NONE: 1016 dinfo->media_cd = media == MEDIA_CDROM; 1017 break; 1018 default: 1019 break; 1020 } 1021 1022 fail: 1023 qemu_opts_del(legacy_opts); 1024 qobject_unref(bs_opts); 1025 return dinfo; 1026 } 1027 1028 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1029 { 1030 BlockDriverState *bs; 1031 1032 bs = bdrv_lookup_bs(name, name, errp); 1033 if (bs == NULL) { 1034 return NULL; 1035 } 1036 1037 if (!bdrv_is_root_node(bs)) { 1038 error_setg(errp, "Need a root block node"); 1039 return NULL; 1040 } 1041 1042 if (!bdrv_is_inserted(bs)) { 1043 error_setg(errp, "Device has no medium"); 1044 return NULL; 1045 } 1046 1047 return bs; 1048 } 1049 1050 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1051 Error **errp) 1052 { 1053 BlockBackend *blk; 1054 1055 if (!blk_name == !qdev_id) { 1056 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1057 return NULL; 1058 } 1059 1060 if (qdev_id) { 1061 blk = blk_by_qdev_id(qdev_id, errp); 1062 } else { 1063 blk = blk_by_name(blk_name); 1064 if (blk == NULL) { 1065 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1066 "Device '%s' not found", blk_name); 1067 } 1068 } 1069 1070 return blk; 1071 } 1072 1073 void hmp_commit(Monitor *mon, const QDict *qdict) 1074 { 1075 const char *device = qdict_get_str(qdict, "device"); 1076 BlockBackend *blk; 1077 int ret; 1078 1079 if (!strcmp(device, "all")) { 1080 ret = blk_commit_all(); 1081 } else { 1082 BlockDriverState *bs; 1083 AioContext *aio_context; 1084 1085 blk = blk_by_name(device); 1086 if (!blk) { 1087 monitor_printf(mon, "Device '%s' not found\n", device); 1088 return; 1089 } 1090 if (!blk_is_available(blk)) { 1091 monitor_printf(mon, "Device '%s' has no medium\n", device); 1092 return; 1093 } 1094 1095 bs = blk_bs(blk); 1096 aio_context = bdrv_get_aio_context(bs); 1097 aio_context_acquire(aio_context); 1098 1099 ret = bdrv_commit(bs); 1100 1101 aio_context_release(aio_context); 1102 } 1103 if (ret < 0) { 1104 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1105 strerror(-ret)); 1106 } 1107 } 1108 1109 static void blockdev_do_action(TransactionAction *action, Error **errp) 1110 { 1111 TransactionActionList list; 1112 1113 list.value = action; 1114 list.next = NULL; 1115 qmp_transaction(&list, false, NULL, errp); 1116 } 1117 1118 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1119 bool has_node_name, const char *node_name, 1120 const char *snapshot_file, 1121 bool has_snapshot_node_name, 1122 const char *snapshot_node_name, 1123 bool has_format, const char *format, 1124 bool has_mode, NewImageMode mode, Error **errp) 1125 { 1126 BlockdevSnapshotSync snapshot = { 1127 .has_device = has_device, 1128 .device = (char *) device, 1129 .has_node_name = has_node_name, 1130 .node_name = (char *) node_name, 1131 .snapshot_file = (char *) snapshot_file, 1132 .has_snapshot_node_name = has_snapshot_node_name, 1133 .snapshot_node_name = (char *) snapshot_node_name, 1134 .has_format = has_format, 1135 .format = (char *) format, 1136 .has_mode = has_mode, 1137 .mode = mode, 1138 }; 1139 TransactionAction action = { 1140 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1141 .u.blockdev_snapshot_sync.data = &snapshot, 1142 }; 1143 blockdev_do_action(&action, errp); 1144 } 1145 1146 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1147 Error **errp) 1148 { 1149 BlockdevSnapshot snapshot_data = { 1150 .node = (char *) node, 1151 .overlay = (char *) overlay 1152 }; 1153 TransactionAction action = { 1154 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1155 .u.blockdev_snapshot.data = &snapshot_data, 1156 }; 1157 blockdev_do_action(&action, errp); 1158 } 1159 1160 void qmp_blockdev_snapshot_internal_sync(const char *device, 1161 const char *name, 1162 Error **errp) 1163 { 1164 BlockdevSnapshotInternal snapshot = { 1165 .device = (char *) device, 1166 .name = (char *) name 1167 }; 1168 TransactionAction action = { 1169 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1170 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1171 }; 1172 blockdev_do_action(&action, errp); 1173 } 1174 1175 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1176 bool has_id, 1177 const char *id, 1178 bool has_name, 1179 const char *name, 1180 Error **errp) 1181 { 1182 BlockDriverState *bs; 1183 AioContext *aio_context; 1184 QEMUSnapshotInfo sn; 1185 Error *local_err = NULL; 1186 SnapshotInfo *info = NULL; 1187 int ret; 1188 1189 bs = qmp_get_root_bs(device, errp); 1190 if (!bs) { 1191 return NULL; 1192 } 1193 aio_context = bdrv_get_aio_context(bs); 1194 aio_context_acquire(aio_context); 1195 1196 if (!has_id) { 1197 id = NULL; 1198 } 1199 1200 if (!has_name) { 1201 name = NULL; 1202 } 1203 1204 if (!id && !name) { 1205 error_setg(errp, "Name or id must be provided"); 1206 goto out_aio_context; 1207 } 1208 1209 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1210 goto out_aio_context; 1211 } 1212 1213 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1214 if (local_err) { 1215 error_propagate(errp, local_err); 1216 goto out_aio_context; 1217 } 1218 if (!ret) { 1219 error_setg(errp, 1220 "Snapshot with id '%s' and name '%s' does not exist on " 1221 "device '%s'", 1222 STR_OR_NULL(id), STR_OR_NULL(name), device); 1223 goto out_aio_context; 1224 } 1225 1226 bdrv_snapshot_delete(bs, id, name, &local_err); 1227 if (local_err) { 1228 error_propagate(errp, local_err); 1229 goto out_aio_context; 1230 } 1231 1232 aio_context_release(aio_context); 1233 1234 info = g_new0(SnapshotInfo, 1); 1235 info->id = g_strdup(sn.id_str); 1236 info->name = g_strdup(sn.name); 1237 info->date_nsec = sn.date_nsec; 1238 info->date_sec = sn.date_sec; 1239 info->vm_state_size = sn.vm_state_size; 1240 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1241 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1242 1243 return info; 1244 1245 out_aio_context: 1246 aio_context_release(aio_context); 1247 return NULL; 1248 } 1249 1250 /** 1251 * block_dirty_bitmap_lookup: 1252 * Return a dirty bitmap (if present), after validating 1253 * the node reference and bitmap names. 1254 * 1255 * @node: The name of the BDS node to search for bitmaps 1256 * @name: The name of the bitmap to search for 1257 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1258 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1259 * @errp: Output pointer for error information. Can be NULL. 1260 * 1261 * @return: A bitmap object on success, or NULL on failure. 1262 */ 1263 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1264 const char *name, 1265 BlockDriverState **pbs, 1266 Error **errp) 1267 { 1268 BlockDriverState *bs; 1269 BdrvDirtyBitmap *bitmap; 1270 1271 if (!node) { 1272 error_setg(errp, "Node cannot be NULL"); 1273 return NULL; 1274 } 1275 if (!name) { 1276 error_setg(errp, "Bitmap name cannot be NULL"); 1277 return NULL; 1278 } 1279 bs = bdrv_lookup_bs(node, node, NULL); 1280 if (!bs) { 1281 error_setg(errp, "Node '%s' not found", node); 1282 return NULL; 1283 } 1284 1285 bitmap = bdrv_find_dirty_bitmap(bs, name); 1286 if (!bitmap) { 1287 error_setg(errp, "Dirty bitmap '%s' not found", name); 1288 return NULL; 1289 } 1290 1291 if (pbs) { 1292 *pbs = bs; 1293 } 1294 1295 return bitmap; 1296 } 1297 1298 /* New and old BlockDriverState structs for atomic group operations */ 1299 1300 typedef struct BlkActionState BlkActionState; 1301 1302 /** 1303 * BlkActionOps: 1304 * Table of operations that define an Action. 1305 * 1306 * @instance_size: Size of state struct, in bytes. 1307 * @prepare: Prepare the work, must NOT be NULL. 1308 * @commit: Commit the changes, can be NULL. 1309 * @abort: Abort the changes on fail, can be NULL. 1310 * @clean: Clean up resources after all transaction actions have called 1311 * commit() or abort(). Can be NULL. 1312 * 1313 * Only prepare() may fail. In a single transaction, only one of commit() or 1314 * abort() will be called. clean() will always be called if it is present. 1315 */ 1316 typedef struct BlkActionOps { 1317 size_t instance_size; 1318 void (*prepare)(BlkActionState *common, Error **errp); 1319 void (*commit)(BlkActionState *common); 1320 void (*abort)(BlkActionState *common); 1321 void (*clean)(BlkActionState *common); 1322 } BlkActionOps; 1323 1324 /** 1325 * BlkActionState: 1326 * Describes one Action's state within a Transaction. 1327 * 1328 * @action: QAPI-defined enum identifying which Action to perform. 1329 * @ops: Table of ActionOps this Action can perform. 1330 * @block_job_txn: Transaction which this action belongs to. 1331 * @entry: List membership for all Actions in this Transaction. 1332 * 1333 * This structure must be arranged as first member in a subclassed type, 1334 * assuming that the compiler will also arrange it to the same offsets as the 1335 * base class. 1336 */ 1337 struct BlkActionState { 1338 TransactionAction *action; 1339 const BlkActionOps *ops; 1340 JobTxn *block_job_txn; 1341 TransactionProperties *txn_props; 1342 QSIMPLEQ_ENTRY(BlkActionState) entry; 1343 }; 1344 1345 /* internal snapshot private data */ 1346 typedef struct InternalSnapshotState { 1347 BlkActionState common; 1348 BlockDriverState *bs; 1349 QEMUSnapshotInfo sn; 1350 bool created; 1351 } InternalSnapshotState; 1352 1353 1354 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1355 { 1356 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1357 error_setg(errp, 1358 "Action '%s' does not support Transaction property " 1359 "completion-mode = %s", 1360 TransactionActionKind_str(s->action->type), 1361 ActionCompletionMode_str(s->txn_props->completion_mode)); 1362 return -1; 1363 } 1364 return 0; 1365 } 1366 1367 static void internal_snapshot_prepare(BlkActionState *common, 1368 Error **errp) 1369 { 1370 Error *local_err = NULL; 1371 const char *device; 1372 const char *name; 1373 BlockDriverState *bs; 1374 QEMUSnapshotInfo old_sn, *sn; 1375 bool ret; 1376 qemu_timeval tv; 1377 BlockdevSnapshotInternal *internal; 1378 InternalSnapshotState *state; 1379 AioContext *aio_context; 1380 int ret1; 1381 1382 g_assert(common->action->type == 1383 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1384 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1385 state = DO_UPCAST(InternalSnapshotState, common, common); 1386 1387 /* 1. parse input */ 1388 device = internal->device; 1389 name = internal->name; 1390 1391 /* 2. check for validation */ 1392 if (action_check_completion_mode(common, errp) < 0) { 1393 return; 1394 } 1395 1396 bs = qmp_get_root_bs(device, errp); 1397 if (!bs) { 1398 return; 1399 } 1400 1401 aio_context = bdrv_get_aio_context(bs); 1402 aio_context_acquire(aio_context); 1403 1404 state->bs = bs; 1405 1406 /* Paired with .clean() */ 1407 bdrv_drained_begin(bs); 1408 1409 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1410 goto out; 1411 } 1412 1413 if (bdrv_is_read_only(bs)) { 1414 error_setg(errp, "Device '%s' is read only", device); 1415 goto out; 1416 } 1417 1418 if (!bdrv_can_snapshot(bs)) { 1419 error_setg(errp, "Block format '%s' used by device '%s' " 1420 "does not support internal snapshots", 1421 bs->drv->format_name, device); 1422 goto out; 1423 } 1424 1425 if (!strlen(name)) { 1426 error_setg(errp, "Name is empty"); 1427 goto out; 1428 } 1429 1430 /* check whether a snapshot with name exist */ 1431 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1432 &local_err); 1433 if (local_err) { 1434 error_propagate(errp, local_err); 1435 goto out; 1436 } else if (ret) { 1437 error_setg(errp, 1438 "Snapshot with name '%s' already exists on device '%s'", 1439 name, device); 1440 goto out; 1441 } 1442 1443 /* 3. take the snapshot */ 1444 sn = &state->sn; 1445 pstrcpy(sn->name, sizeof(sn->name), name); 1446 qemu_gettimeofday(&tv); 1447 sn->date_sec = tv.tv_sec; 1448 sn->date_nsec = tv.tv_usec * 1000; 1449 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1450 1451 ret1 = bdrv_snapshot_create(bs, sn); 1452 if (ret1 < 0) { 1453 error_setg_errno(errp, -ret1, 1454 "Failed to create snapshot '%s' on device '%s'", 1455 name, device); 1456 goto out; 1457 } 1458 1459 /* 4. succeed, mark a snapshot is created */ 1460 state->created = true; 1461 1462 out: 1463 aio_context_release(aio_context); 1464 } 1465 1466 static void internal_snapshot_abort(BlkActionState *common) 1467 { 1468 InternalSnapshotState *state = 1469 DO_UPCAST(InternalSnapshotState, common, common); 1470 BlockDriverState *bs = state->bs; 1471 QEMUSnapshotInfo *sn = &state->sn; 1472 AioContext *aio_context; 1473 Error *local_error = NULL; 1474 1475 if (!state->created) { 1476 return; 1477 } 1478 1479 aio_context = bdrv_get_aio_context(state->bs); 1480 aio_context_acquire(aio_context); 1481 1482 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1483 error_reportf_err(local_error, 1484 "Failed to delete snapshot with id '%s' and " 1485 "name '%s' on device '%s' in abort: ", 1486 sn->id_str, sn->name, 1487 bdrv_get_device_name(bs)); 1488 } 1489 1490 aio_context_release(aio_context); 1491 } 1492 1493 static void internal_snapshot_clean(BlkActionState *common) 1494 { 1495 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1496 common, common); 1497 AioContext *aio_context; 1498 1499 if (!state->bs) { 1500 return; 1501 } 1502 1503 aio_context = bdrv_get_aio_context(state->bs); 1504 aio_context_acquire(aio_context); 1505 1506 bdrv_drained_end(state->bs); 1507 1508 aio_context_release(aio_context); 1509 } 1510 1511 /* external snapshot private data */ 1512 typedef struct ExternalSnapshotState { 1513 BlkActionState common; 1514 BlockDriverState *old_bs; 1515 BlockDriverState *new_bs; 1516 bool overlay_appended; 1517 } ExternalSnapshotState; 1518 1519 static void external_snapshot_prepare(BlkActionState *common, 1520 Error **errp) 1521 { 1522 int flags = 0; 1523 QDict *options = NULL; 1524 Error *local_err = NULL; 1525 /* Device and node name of the image to generate the snapshot from */ 1526 const char *device; 1527 const char *node_name; 1528 /* Reference to the new image (for 'blockdev-snapshot') */ 1529 const char *snapshot_ref; 1530 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1531 const char *new_image_file; 1532 ExternalSnapshotState *state = 1533 DO_UPCAST(ExternalSnapshotState, common, common); 1534 TransactionAction *action = common->action; 1535 AioContext *aio_context; 1536 1537 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1538 * purpose but a different set of parameters */ 1539 switch (action->type) { 1540 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1541 { 1542 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1543 device = s->node; 1544 node_name = s->node; 1545 new_image_file = NULL; 1546 snapshot_ref = s->overlay; 1547 } 1548 break; 1549 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1550 { 1551 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1552 device = s->has_device ? s->device : NULL; 1553 node_name = s->has_node_name ? s->node_name : NULL; 1554 new_image_file = s->snapshot_file; 1555 snapshot_ref = NULL; 1556 } 1557 break; 1558 default: 1559 g_assert_not_reached(); 1560 } 1561 1562 /* start processing */ 1563 if (action_check_completion_mode(common, errp) < 0) { 1564 return; 1565 } 1566 1567 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1568 if (!state->old_bs) { 1569 return; 1570 } 1571 1572 aio_context = bdrv_get_aio_context(state->old_bs); 1573 aio_context_acquire(aio_context); 1574 1575 /* Paired with .clean() */ 1576 bdrv_drained_begin(state->old_bs); 1577 1578 if (!bdrv_is_inserted(state->old_bs)) { 1579 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1580 goto out; 1581 } 1582 1583 if (bdrv_op_is_blocked(state->old_bs, 1584 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1585 goto out; 1586 } 1587 1588 if (!bdrv_is_read_only(state->old_bs)) { 1589 if (bdrv_flush(state->old_bs)) { 1590 error_setg(errp, QERR_IO_ERROR); 1591 goto out; 1592 } 1593 } 1594 1595 if (!bdrv_is_first_non_filter(state->old_bs)) { 1596 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1597 goto out; 1598 } 1599 1600 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1601 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1602 const char *format = s->has_format ? s->format : "qcow2"; 1603 enum NewImageMode mode; 1604 const char *snapshot_node_name = 1605 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1606 1607 if (node_name && !snapshot_node_name) { 1608 error_setg(errp, "New snapshot node name missing"); 1609 goto out; 1610 } 1611 1612 if (snapshot_node_name && 1613 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1614 error_setg(errp, "New snapshot node name already in use"); 1615 goto out; 1616 } 1617 1618 flags = state->old_bs->open_flags; 1619 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1620 flags |= BDRV_O_NO_BACKING; 1621 1622 /* create new image w/backing file */ 1623 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1624 if (mode != NEW_IMAGE_MODE_EXISTING) { 1625 int64_t size = bdrv_getlength(state->old_bs); 1626 if (size < 0) { 1627 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1628 goto out; 1629 } 1630 bdrv_img_create(new_image_file, format, 1631 state->old_bs->filename, 1632 state->old_bs->drv->format_name, 1633 NULL, size, flags, false, &local_err); 1634 if (local_err) { 1635 error_propagate(errp, local_err); 1636 goto out; 1637 } 1638 } 1639 1640 options = qdict_new(); 1641 if (s->has_snapshot_node_name) { 1642 qdict_put_str(options, "node-name", snapshot_node_name); 1643 } 1644 qdict_put_str(options, "driver", format); 1645 } 1646 1647 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1648 errp); 1649 /* We will manually add the backing_hd field to the bs later */ 1650 if (!state->new_bs) { 1651 goto out; 1652 } 1653 1654 if (bdrv_has_blk(state->new_bs)) { 1655 error_setg(errp, "The snapshot is already in use"); 1656 goto out; 1657 } 1658 1659 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1660 errp)) { 1661 goto out; 1662 } 1663 1664 if (state->new_bs->backing != NULL) { 1665 error_setg(errp, "The snapshot already has a backing image"); 1666 goto out; 1667 } 1668 1669 if (!state->new_bs->drv->supports_backing) { 1670 error_setg(errp, "The snapshot does not support backing images"); 1671 goto out; 1672 } 1673 1674 bdrv_set_aio_context(state->new_bs, aio_context); 1675 1676 /* This removes our old bs and adds the new bs. This is an operation that 1677 * can fail, so we need to do it in .prepare; undoing it for abort is 1678 * always possible. */ 1679 bdrv_ref(state->new_bs); 1680 bdrv_append(state->new_bs, state->old_bs, &local_err); 1681 if (local_err) { 1682 error_propagate(errp, local_err); 1683 goto out; 1684 } 1685 state->overlay_appended = true; 1686 1687 out: 1688 aio_context_release(aio_context); 1689 } 1690 1691 static void external_snapshot_commit(BlkActionState *common) 1692 { 1693 ExternalSnapshotState *state = 1694 DO_UPCAST(ExternalSnapshotState, common, common); 1695 AioContext *aio_context; 1696 1697 aio_context = bdrv_get_aio_context(state->old_bs); 1698 aio_context_acquire(aio_context); 1699 1700 /* We don't need (or want) to use the transactional 1701 * bdrv_reopen_multiple() across all the entries at once, because we 1702 * don't want to abort all of them if one of them fails the reopen */ 1703 if (!atomic_read(&state->old_bs->copy_on_read)) { 1704 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR, 1705 NULL); 1706 } 1707 1708 aio_context_release(aio_context); 1709 } 1710 1711 static void external_snapshot_abort(BlkActionState *common) 1712 { 1713 ExternalSnapshotState *state = 1714 DO_UPCAST(ExternalSnapshotState, common, common); 1715 if (state->new_bs) { 1716 if (state->overlay_appended) { 1717 AioContext *aio_context; 1718 1719 aio_context = bdrv_get_aio_context(state->old_bs); 1720 aio_context_acquire(aio_context); 1721 1722 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1723 close state->old_bs; we need it */ 1724 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1725 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1726 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1727 1728 aio_context_release(aio_context); 1729 } 1730 } 1731 } 1732 1733 static void external_snapshot_clean(BlkActionState *common) 1734 { 1735 ExternalSnapshotState *state = 1736 DO_UPCAST(ExternalSnapshotState, common, common); 1737 AioContext *aio_context; 1738 1739 if (!state->old_bs) { 1740 return; 1741 } 1742 1743 aio_context = bdrv_get_aio_context(state->old_bs); 1744 aio_context_acquire(aio_context); 1745 1746 bdrv_drained_end(state->old_bs); 1747 bdrv_unref(state->new_bs); 1748 1749 aio_context_release(aio_context); 1750 } 1751 1752 typedef struct DriveBackupState { 1753 BlkActionState common; 1754 BlockDriverState *bs; 1755 BlockJob *job; 1756 } DriveBackupState; 1757 1758 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1759 Error **errp); 1760 1761 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1762 { 1763 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1764 BlockDriverState *bs; 1765 DriveBackup *backup; 1766 AioContext *aio_context; 1767 Error *local_err = NULL; 1768 1769 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1770 backup = common->action->u.drive_backup.data; 1771 1772 bs = qmp_get_root_bs(backup->device, errp); 1773 if (!bs) { 1774 return; 1775 } 1776 1777 aio_context = bdrv_get_aio_context(bs); 1778 aio_context_acquire(aio_context); 1779 1780 /* Paired with .clean() */ 1781 bdrv_drained_begin(bs); 1782 1783 state->bs = bs; 1784 1785 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1786 if (local_err) { 1787 error_propagate(errp, local_err); 1788 goto out; 1789 } 1790 1791 out: 1792 aio_context_release(aio_context); 1793 } 1794 1795 static void drive_backup_commit(BlkActionState *common) 1796 { 1797 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1798 AioContext *aio_context; 1799 1800 aio_context = bdrv_get_aio_context(state->bs); 1801 aio_context_acquire(aio_context); 1802 1803 assert(state->job); 1804 job_start(&state->job->job); 1805 1806 aio_context_release(aio_context); 1807 } 1808 1809 static void drive_backup_abort(BlkActionState *common) 1810 { 1811 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1812 1813 if (state->job) { 1814 AioContext *aio_context; 1815 1816 aio_context = bdrv_get_aio_context(state->bs); 1817 aio_context_acquire(aio_context); 1818 1819 job_cancel_sync(&state->job->job); 1820 1821 aio_context_release(aio_context); 1822 } 1823 } 1824 1825 static void drive_backup_clean(BlkActionState *common) 1826 { 1827 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1828 AioContext *aio_context; 1829 1830 if (!state->bs) { 1831 return; 1832 } 1833 1834 aio_context = bdrv_get_aio_context(state->bs); 1835 aio_context_acquire(aio_context); 1836 1837 bdrv_drained_end(state->bs); 1838 1839 aio_context_release(aio_context); 1840 } 1841 1842 typedef struct BlockdevBackupState { 1843 BlkActionState common; 1844 BlockDriverState *bs; 1845 BlockJob *job; 1846 } BlockdevBackupState; 1847 1848 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1849 Error **errp); 1850 1851 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1852 { 1853 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1854 BlockdevBackup *backup; 1855 BlockDriverState *bs, *target; 1856 AioContext *aio_context; 1857 Error *local_err = NULL; 1858 1859 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1860 backup = common->action->u.blockdev_backup.data; 1861 1862 bs = qmp_get_root_bs(backup->device, errp); 1863 if (!bs) { 1864 return; 1865 } 1866 1867 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1868 if (!target) { 1869 return; 1870 } 1871 1872 aio_context = bdrv_get_aio_context(bs); 1873 if (aio_context != bdrv_get_aio_context(target)) { 1874 error_setg(errp, "Backup between two IO threads is not implemented"); 1875 return; 1876 } 1877 aio_context_acquire(aio_context); 1878 state->bs = bs; 1879 1880 /* Paired with .clean() */ 1881 bdrv_drained_begin(state->bs); 1882 1883 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1884 if (local_err) { 1885 error_propagate(errp, local_err); 1886 goto out; 1887 } 1888 1889 out: 1890 aio_context_release(aio_context); 1891 } 1892 1893 static void blockdev_backup_commit(BlkActionState *common) 1894 { 1895 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1896 AioContext *aio_context; 1897 1898 aio_context = bdrv_get_aio_context(state->bs); 1899 aio_context_acquire(aio_context); 1900 1901 assert(state->job); 1902 job_start(&state->job->job); 1903 1904 aio_context_release(aio_context); 1905 } 1906 1907 static void blockdev_backup_abort(BlkActionState *common) 1908 { 1909 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1910 1911 if (state->job) { 1912 AioContext *aio_context; 1913 1914 aio_context = bdrv_get_aio_context(state->bs); 1915 aio_context_acquire(aio_context); 1916 1917 job_cancel_sync(&state->job->job); 1918 1919 aio_context_release(aio_context); 1920 } 1921 } 1922 1923 static void blockdev_backup_clean(BlkActionState *common) 1924 { 1925 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1926 AioContext *aio_context; 1927 1928 if (!state->bs) { 1929 return; 1930 } 1931 1932 aio_context = bdrv_get_aio_context(state->bs); 1933 aio_context_acquire(aio_context); 1934 1935 bdrv_drained_end(state->bs); 1936 1937 aio_context_release(aio_context); 1938 } 1939 1940 typedef struct BlockDirtyBitmapState { 1941 BlkActionState common; 1942 BdrvDirtyBitmap *bitmap; 1943 BlockDriverState *bs; 1944 HBitmap *backup; 1945 bool prepared; 1946 bool was_enabled; 1947 } BlockDirtyBitmapState; 1948 1949 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1950 Error **errp) 1951 { 1952 Error *local_err = NULL; 1953 BlockDirtyBitmapAdd *action; 1954 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1955 common, common); 1956 1957 if (action_check_completion_mode(common, errp) < 0) { 1958 return; 1959 } 1960 1961 action = common->action->u.block_dirty_bitmap_add.data; 1962 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1963 qmp_block_dirty_bitmap_add(action->node, action->name, 1964 action->has_granularity, action->granularity, 1965 action->has_persistent, action->persistent, 1966 action->has_autoload, action->autoload, 1967 action->has_x_disabled, action->x_disabled, 1968 &local_err); 1969 1970 if (!local_err) { 1971 state->prepared = true; 1972 } else { 1973 error_propagate(errp, local_err); 1974 } 1975 } 1976 1977 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1978 { 1979 BlockDirtyBitmapAdd *action; 1980 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1981 common, common); 1982 1983 action = common->action->u.block_dirty_bitmap_add.data; 1984 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1985 * then the node reference and bitmap name must have been valid. 1986 */ 1987 if (state->prepared) { 1988 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1989 } 1990 } 1991 1992 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1993 Error **errp) 1994 { 1995 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1996 common, common); 1997 BlockDirtyBitmap *action; 1998 1999 if (action_check_completion_mode(common, errp) < 0) { 2000 return; 2001 } 2002 2003 action = common->action->u.block_dirty_bitmap_clear.data; 2004 state->bitmap = block_dirty_bitmap_lookup(action->node, 2005 action->name, 2006 &state->bs, 2007 errp); 2008 if (!state->bitmap) { 2009 return; 2010 } 2011 2012 if (bdrv_dirty_bitmap_frozen(state->bitmap)) { 2013 error_setg(errp, "Cannot modify a frozen bitmap"); 2014 return; 2015 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) { 2016 error_setg(errp, "Cannot modify a locked bitmap"); 2017 return; 2018 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) { 2019 error_setg(errp, "Cannot clear a disabled bitmap"); 2020 return; 2021 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) { 2022 error_setg(errp, "Cannot clear a readonly bitmap"); 2023 return; 2024 } 2025 2026 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2027 } 2028 2029 static void block_dirty_bitmap_clear_abort(BlkActionState *common) 2030 { 2031 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2032 common, common); 2033 2034 if (state->backup) { 2035 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup); 2036 } 2037 } 2038 2039 static void block_dirty_bitmap_clear_commit(BlkActionState *common) 2040 { 2041 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2042 common, common); 2043 2044 hbitmap_free(state->backup); 2045 } 2046 2047 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2048 Error **errp) 2049 { 2050 BlockDirtyBitmap *action; 2051 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2052 common, common); 2053 2054 if (action_check_completion_mode(common, errp) < 0) { 2055 return; 2056 } 2057 2058 action = common->action->u.x_block_dirty_bitmap_enable.data; 2059 state->bitmap = block_dirty_bitmap_lookup(action->node, 2060 action->name, 2061 NULL, 2062 errp); 2063 if (!state->bitmap) { 2064 return; 2065 } 2066 2067 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2068 bdrv_enable_dirty_bitmap(state->bitmap); 2069 } 2070 2071 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2072 { 2073 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2074 common, common); 2075 2076 if (!state->was_enabled) { 2077 bdrv_disable_dirty_bitmap(state->bitmap); 2078 } 2079 } 2080 2081 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2082 Error **errp) 2083 { 2084 BlockDirtyBitmap *action; 2085 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2086 common, common); 2087 2088 if (action_check_completion_mode(common, errp) < 0) { 2089 return; 2090 } 2091 2092 action = common->action->u.x_block_dirty_bitmap_disable.data; 2093 state->bitmap = block_dirty_bitmap_lookup(action->node, 2094 action->name, 2095 NULL, 2096 errp); 2097 if (!state->bitmap) { 2098 return; 2099 } 2100 2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2102 bdrv_disable_dirty_bitmap(state->bitmap); 2103 } 2104 2105 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2106 { 2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2108 common, common); 2109 2110 if (state->was_enabled) { 2111 bdrv_enable_dirty_bitmap(state->bitmap); 2112 } 2113 } 2114 2115 static void abort_prepare(BlkActionState *common, Error **errp) 2116 { 2117 error_setg(errp, "Transaction aborted using Abort action"); 2118 } 2119 2120 static void abort_commit(BlkActionState *common) 2121 { 2122 g_assert_not_reached(); /* this action never succeeds */ 2123 } 2124 2125 static const BlkActionOps actions[] = { 2126 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2127 .instance_size = sizeof(ExternalSnapshotState), 2128 .prepare = external_snapshot_prepare, 2129 .commit = external_snapshot_commit, 2130 .abort = external_snapshot_abort, 2131 .clean = external_snapshot_clean, 2132 }, 2133 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2134 .instance_size = sizeof(ExternalSnapshotState), 2135 .prepare = external_snapshot_prepare, 2136 .commit = external_snapshot_commit, 2137 .abort = external_snapshot_abort, 2138 .clean = external_snapshot_clean, 2139 }, 2140 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2141 .instance_size = sizeof(DriveBackupState), 2142 .prepare = drive_backup_prepare, 2143 .commit = drive_backup_commit, 2144 .abort = drive_backup_abort, 2145 .clean = drive_backup_clean, 2146 }, 2147 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2148 .instance_size = sizeof(BlockdevBackupState), 2149 .prepare = blockdev_backup_prepare, 2150 .commit = blockdev_backup_commit, 2151 .abort = blockdev_backup_abort, 2152 .clean = blockdev_backup_clean, 2153 }, 2154 [TRANSACTION_ACTION_KIND_ABORT] = { 2155 .instance_size = sizeof(BlkActionState), 2156 .prepare = abort_prepare, 2157 .commit = abort_commit, 2158 }, 2159 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2160 .instance_size = sizeof(InternalSnapshotState), 2161 .prepare = internal_snapshot_prepare, 2162 .abort = internal_snapshot_abort, 2163 .clean = internal_snapshot_clean, 2164 }, 2165 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2166 .instance_size = sizeof(BlockDirtyBitmapState), 2167 .prepare = block_dirty_bitmap_add_prepare, 2168 .abort = block_dirty_bitmap_add_abort, 2169 }, 2170 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2171 .instance_size = sizeof(BlockDirtyBitmapState), 2172 .prepare = block_dirty_bitmap_clear_prepare, 2173 .commit = block_dirty_bitmap_clear_commit, 2174 .abort = block_dirty_bitmap_clear_abort, 2175 }, 2176 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = { 2177 .instance_size = sizeof(BlockDirtyBitmapState), 2178 .prepare = block_dirty_bitmap_enable_prepare, 2179 .abort = block_dirty_bitmap_enable_abort, 2180 }, 2181 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = { 2182 .instance_size = sizeof(BlockDirtyBitmapState), 2183 .prepare = block_dirty_bitmap_disable_prepare, 2184 .abort = block_dirty_bitmap_disable_abort, 2185 } 2186 }; 2187 2188 /** 2189 * Allocate a TransactionProperties structure if necessary, and fill 2190 * that structure with desired defaults if they are unset. 2191 */ 2192 static TransactionProperties *get_transaction_properties( 2193 TransactionProperties *props) 2194 { 2195 if (!props) { 2196 props = g_new0(TransactionProperties, 1); 2197 } 2198 2199 if (!props->has_completion_mode) { 2200 props->has_completion_mode = true; 2201 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2202 } 2203 2204 return props; 2205 } 2206 2207 /* 2208 * 'Atomic' group operations. The operations are performed as a set, and if 2209 * any fail then we roll back all operations in the group. 2210 */ 2211 void qmp_transaction(TransactionActionList *dev_list, 2212 bool has_props, 2213 struct TransactionProperties *props, 2214 Error **errp) 2215 { 2216 TransactionActionList *dev_entry = dev_list; 2217 JobTxn *block_job_txn = NULL; 2218 BlkActionState *state, *next; 2219 Error *local_err = NULL; 2220 2221 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; 2222 QSIMPLEQ_INIT(&snap_bdrv_states); 2223 2224 /* Does this transaction get canceled as a group on failure? 2225 * If not, we don't really need to make a JobTxn. 2226 */ 2227 props = get_transaction_properties(props); 2228 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2229 block_job_txn = job_txn_new(); 2230 } 2231 2232 /* drain all i/o before any operations */ 2233 bdrv_drain_all(); 2234 2235 /* We don't do anything in this loop that commits us to the operations */ 2236 while (NULL != dev_entry) { 2237 TransactionAction *dev_info = NULL; 2238 const BlkActionOps *ops; 2239 2240 dev_info = dev_entry->value; 2241 dev_entry = dev_entry->next; 2242 2243 assert(dev_info->type < ARRAY_SIZE(actions)); 2244 2245 ops = &actions[dev_info->type]; 2246 assert(ops->instance_size > 0); 2247 2248 state = g_malloc0(ops->instance_size); 2249 state->ops = ops; 2250 state->action = dev_info; 2251 state->block_job_txn = block_job_txn; 2252 state->txn_props = props; 2253 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2254 2255 state->ops->prepare(state, &local_err); 2256 if (local_err) { 2257 error_propagate(errp, local_err); 2258 goto delete_and_fail; 2259 } 2260 } 2261 2262 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2263 if (state->ops->commit) { 2264 state->ops->commit(state); 2265 } 2266 } 2267 2268 /* success */ 2269 goto exit; 2270 2271 delete_and_fail: 2272 /* failure, and it is all-or-none; roll back all operations */ 2273 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2274 if (state->ops->abort) { 2275 state->ops->abort(state); 2276 } 2277 } 2278 exit: 2279 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2280 if (state->ops->clean) { 2281 state->ops->clean(state); 2282 } 2283 g_free(state); 2284 } 2285 if (!has_props) { 2286 qapi_free_TransactionProperties(props); 2287 } 2288 job_txn_unref(block_job_txn); 2289 } 2290 2291 void qmp_eject(bool has_device, const char *device, 2292 bool has_id, const char *id, 2293 bool has_force, bool force, Error **errp) 2294 { 2295 Error *local_err = NULL; 2296 int rc; 2297 2298 if (!has_force) { 2299 force = false; 2300 } 2301 2302 rc = do_open_tray(has_device ? device : NULL, 2303 has_id ? id : NULL, 2304 force, &local_err); 2305 if (rc && rc != -ENOSYS) { 2306 error_propagate(errp, local_err); 2307 return; 2308 } 2309 error_free(local_err); 2310 2311 blockdev_remove_medium(has_device, device, has_id, id, errp); 2312 } 2313 2314 void qmp_block_passwd(bool has_device, const char *device, 2315 bool has_node_name, const char *node_name, 2316 const char *password, Error **errp) 2317 { 2318 error_setg(errp, 2319 "Setting block passwords directly is no longer supported"); 2320 } 2321 2322 /* 2323 * Attempt to open the tray of @device. 2324 * If @force, ignore its tray lock. 2325 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2326 * On error, store an error through @errp and return -errno. 2327 * If @device does not exist, return -ENODEV. 2328 * If it has no removable media, return -ENOTSUP. 2329 * If it has no tray, return -ENOSYS. 2330 * If the guest was asked to open the tray, return -EINPROGRESS. 2331 * Else, return 0. 2332 */ 2333 static int do_open_tray(const char *blk_name, const char *qdev_id, 2334 bool force, Error **errp) 2335 { 2336 BlockBackend *blk; 2337 const char *device = qdev_id ?: blk_name; 2338 bool locked; 2339 2340 blk = qmp_get_blk(blk_name, qdev_id, errp); 2341 if (!blk) { 2342 return -ENODEV; 2343 } 2344 2345 if (!blk_dev_has_removable_media(blk)) { 2346 error_setg(errp, "Device '%s' is not removable", device); 2347 return -ENOTSUP; 2348 } 2349 2350 if (!blk_dev_has_tray(blk)) { 2351 error_setg(errp, "Device '%s' does not have a tray", device); 2352 return -ENOSYS; 2353 } 2354 2355 if (blk_dev_is_tray_open(blk)) { 2356 return 0; 2357 } 2358 2359 locked = blk_dev_is_medium_locked(blk); 2360 if (locked) { 2361 blk_dev_eject_request(blk, force); 2362 } 2363 2364 if (!locked || force) { 2365 blk_dev_change_media_cb(blk, false, &error_abort); 2366 } 2367 2368 if (locked && !force) { 2369 error_setg(errp, "Device '%s' is locked and force was not specified, " 2370 "wait for tray to open and try again", device); 2371 return -EINPROGRESS; 2372 } 2373 2374 return 0; 2375 } 2376 2377 void qmp_blockdev_open_tray(bool has_device, const char *device, 2378 bool has_id, const char *id, 2379 bool has_force, bool force, 2380 Error **errp) 2381 { 2382 Error *local_err = NULL; 2383 int rc; 2384 2385 if (!has_force) { 2386 force = false; 2387 } 2388 rc = do_open_tray(has_device ? device : NULL, 2389 has_id ? id : NULL, 2390 force, &local_err); 2391 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2392 error_propagate(errp, local_err); 2393 return; 2394 } 2395 error_free(local_err); 2396 } 2397 2398 void qmp_blockdev_close_tray(bool has_device, const char *device, 2399 bool has_id, const char *id, 2400 Error **errp) 2401 { 2402 BlockBackend *blk; 2403 Error *local_err = NULL; 2404 2405 device = has_device ? device : NULL; 2406 id = has_id ? id : NULL; 2407 2408 blk = qmp_get_blk(device, id, errp); 2409 if (!blk) { 2410 return; 2411 } 2412 2413 if (!blk_dev_has_removable_media(blk)) { 2414 error_setg(errp, "Device '%s' is not removable", device ?: id); 2415 return; 2416 } 2417 2418 if (!blk_dev_has_tray(blk)) { 2419 /* Ignore this command on tray-less devices */ 2420 return; 2421 } 2422 2423 if (!blk_dev_is_tray_open(blk)) { 2424 return; 2425 } 2426 2427 blk_dev_change_media_cb(blk, true, &local_err); 2428 if (local_err) { 2429 error_propagate(errp, local_err); 2430 return; 2431 } 2432 } 2433 2434 static void blockdev_remove_medium(bool has_device, const char *device, 2435 bool has_id, const char *id, Error **errp) 2436 { 2437 BlockBackend *blk; 2438 BlockDriverState *bs; 2439 AioContext *aio_context; 2440 bool has_attached_device; 2441 2442 device = has_device ? device : NULL; 2443 id = has_id ? id : NULL; 2444 2445 blk = qmp_get_blk(device, id, errp); 2446 if (!blk) { 2447 return; 2448 } 2449 2450 /* For BBs without a device, we can exchange the BDS tree at will */ 2451 has_attached_device = blk_get_attached_dev(blk); 2452 2453 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2454 error_setg(errp, "Device '%s' is not removable", device ?: id); 2455 return; 2456 } 2457 2458 if (has_attached_device && blk_dev_has_tray(blk) && 2459 !blk_dev_is_tray_open(blk)) 2460 { 2461 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2462 return; 2463 } 2464 2465 bs = blk_bs(blk); 2466 if (!bs) { 2467 return; 2468 } 2469 2470 aio_context = bdrv_get_aio_context(bs); 2471 aio_context_acquire(aio_context); 2472 2473 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2474 goto out; 2475 } 2476 2477 blk_remove_bs(blk); 2478 2479 if (!blk_dev_has_tray(blk)) { 2480 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2481 * called at all); therefore, the medium needs to be ejected here. 2482 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2483 * value passed here (i.e. false). */ 2484 blk_dev_change_media_cb(blk, false, &error_abort); 2485 } 2486 2487 out: 2488 aio_context_release(aio_context); 2489 } 2490 2491 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2492 { 2493 blockdev_remove_medium(false, NULL, true, id, errp); 2494 } 2495 2496 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2497 BlockDriverState *bs, Error **errp) 2498 { 2499 Error *local_err = NULL; 2500 bool has_device; 2501 int ret; 2502 2503 /* For BBs without a device, we can exchange the BDS tree at will */ 2504 has_device = blk_get_attached_dev(blk); 2505 2506 if (has_device && !blk_dev_has_removable_media(blk)) { 2507 error_setg(errp, "Device is not removable"); 2508 return; 2509 } 2510 2511 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2512 error_setg(errp, "Tray of the device is not open"); 2513 return; 2514 } 2515 2516 if (blk_bs(blk)) { 2517 error_setg(errp, "There already is a medium in the device"); 2518 return; 2519 } 2520 2521 ret = blk_insert_bs(blk, bs, errp); 2522 if (ret < 0) { 2523 return; 2524 } 2525 2526 if (!blk_dev_has_tray(blk)) { 2527 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2528 * called at all); therefore, the medium needs to be pushed into the 2529 * slot here. 2530 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2531 * value passed here (i.e. true). */ 2532 blk_dev_change_media_cb(blk, true, &local_err); 2533 if (local_err) { 2534 error_propagate(errp, local_err); 2535 blk_remove_bs(blk); 2536 return; 2537 } 2538 } 2539 } 2540 2541 static void blockdev_insert_medium(bool has_device, const char *device, 2542 bool has_id, const char *id, 2543 const char *node_name, Error **errp) 2544 { 2545 BlockBackend *blk; 2546 BlockDriverState *bs; 2547 2548 blk = qmp_get_blk(has_device ? device : NULL, 2549 has_id ? id : NULL, 2550 errp); 2551 if (!blk) { 2552 return; 2553 } 2554 2555 bs = bdrv_find_node(node_name); 2556 if (!bs) { 2557 error_setg(errp, "Node '%s' not found", node_name); 2558 return; 2559 } 2560 2561 if (bdrv_has_blk(bs)) { 2562 error_setg(errp, "Node '%s' is already in use", node_name); 2563 return; 2564 } 2565 2566 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2567 } 2568 2569 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2570 Error **errp) 2571 { 2572 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2573 } 2574 2575 void qmp_blockdev_change_medium(bool has_device, const char *device, 2576 bool has_id, const char *id, 2577 const char *filename, 2578 bool has_format, const char *format, 2579 bool has_read_only, 2580 BlockdevChangeReadOnlyMode read_only, 2581 Error **errp) 2582 { 2583 BlockBackend *blk; 2584 BlockDriverState *medium_bs = NULL; 2585 int bdrv_flags; 2586 bool detect_zeroes; 2587 int rc; 2588 QDict *options = NULL; 2589 Error *err = NULL; 2590 2591 blk = qmp_get_blk(has_device ? device : NULL, 2592 has_id ? id : NULL, 2593 errp); 2594 if (!blk) { 2595 goto fail; 2596 } 2597 2598 if (blk_bs(blk)) { 2599 blk_update_root_state(blk); 2600 } 2601 2602 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2603 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2604 BDRV_O_PROTOCOL); 2605 2606 if (!has_read_only) { 2607 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2608 } 2609 2610 switch (read_only) { 2611 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2612 break; 2613 2614 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2615 bdrv_flags &= ~BDRV_O_RDWR; 2616 break; 2617 2618 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2619 bdrv_flags |= BDRV_O_RDWR; 2620 break; 2621 2622 default: 2623 abort(); 2624 } 2625 2626 options = qdict_new(); 2627 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2628 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2629 2630 if (has_format) { 2631 qdict_put_str(options, "driver", format); 2632 } 2633 2634 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2635 if (!medium_bs) { 2636 goto fail; 2637 } 2638 2639 rc = do_open_tray(has_device ? device : NULL, 2640 has_id ? id : NULL, 2641 false, &err); 2642 if (rc && rc != -ENOSYS) { 2643 error_propagate(errp, err); 2644 goto fail; 2645 } 2646 error_free(err); 2647 err = NULL; 2648 2649 blockdev_remove_medium(has_device, device, has_id, id, &err); 2650 if (err) { 2651 error_propagate(errp, err); 2652 goto fail; 2653 } 2654 2655 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2656 if (err) { 2657 error_propagate(errp, err); 2658 goto fail; 2659 } 2660 2661 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2662 2663 fail: 2664 /* If the medium has been inserted, the device has its own reference, so 2665 * ours must be relinquished; and if it has not been inserted successfully, 2666 * the reference must be relinquished anyway */ 2667 bdrv_unref(medium_bs); 2668 } 2669 2670 /* throttling disk I/O limits */ 2671 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2672 { 2673 ThrottleConfig cfg; 2674 BlockDriverState *bs; 2675 BlockBackend *blk; 2676 AioContext *aio_context; 2677 2678 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2679 arg->has_id ? arg->id : NULL, 2680 errp); 2681 if (!blk) { 2682 return; 2683 } 2684 2685 aio_context = blk_get_aio_context(blk); 2686 aio_context_acquire(aio_context); 2687 2688 bs = blk_bs(blk); 2689 if (!bs) { 2690 error_setg(errp, "Device has no medium"); 2691 goto out; 2692 } 2693 2694 throttle_config_init(&cfg); 2695 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2696 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2697 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2698 2699 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2700 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2701 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2702 2703 if (arg->has_bps_max) { 2704 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2705 } 2706 if (arg->has_bps_rd_max) { 2707 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2708 } 2709 if (arg->has_bps_wr_max) { 2710 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2711 } 2712 if (arg->has_iops_max) { 2713 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2714 } 2715 if (arg->has_iops_rd_max) { 2716 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2717 } 2718 if (arg->has_iops_wr_max) { 2719 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2720 } 2721 2722 if (arg->has_bps_max_length) { 2723 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2724 } 2725 if (arg->has_bps_rd_max_length) { 2726 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2727 } 2728 if (arg->has_bps_wr_max_length) { 2729 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2730 } 2731 if (arg->has_iops_max_length) { 2732 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2733 } 2734 if (arg->has_iops_rd_max_length) { 2735 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2736 } 2737 if (arg->has_iops_wr_max_length) { 2738 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2739 } 2740 2741 if (arg->has_iops_size) { 2742 cfg.op_size = arg->iops_size; 2743 } 2744 2745 if (!throttle_is_valid(&cfg, errp)) { 2746 goto out; 2747 } 2748 2749 if (throttle_enabled(&cfg)) { 2750 /* Enable I/O limits if they're not enabled yet, otherwise 2751 * just update the throttling group. */ 2752 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2753 blk_io_limits_enable(blk, 2754 arg->has_group ? arg->group : 2755 arg->has_device ? arg->device : 2756 arg->id); 2757 } else if (arg->has_group) { 2758 blk_io_limits_update_group(blk, arg->group); 2759 } 2760 /* Set the new throttling configuration */ 2761 blk_set_io_limits(blk, &cfg); 2762 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2763 /* If all throttling settings are set to 0, disable I/O limits */ 2764 blk_io_limits_disable(blk); 2765 } 2766 2767 out: 2768 aio_context_release(aio_context); 2769 } 2770 2771 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2772 bool has_granularity, uint32_t granularity, 2773 bool has_persistent, bool persistent, 2774 bool has_autoload, bool autoload, 2775 bool has_disabled, bool disabled, 2776 Error **errp) 2777 { 2778 BlockDriverState *bs; 2779 BdrvDirtyBitmap *bitmap; 2780 2781 if (!name || name[0] == '\0') { 2782 error_setg(errp, "Bitmap name cannot be empty"); 2783 return; 2784 } 2785 2786 bs = bdrv_lookup_bs(node, node, errp); 2787 if (!bs) { 2788 return; 2789 } 2790 2791 if (has_granularity) { 2792 if (granularity < 512 || !is_power_of_2(granularity)) { 2793 error_setg(errp, "Granularity must be power of 2 " 2794 "and at least 512"); 2795 return; 2796 } 2797 } else { 2798 /* Default to cluster size, if available: */ 2799 granularity = bdrv_get_default_bitmap_granularity(bs); 2800 } 2801 2802 if (!has_persistent) { 2803 persistent = false; 2804 } 2805 2806 if (has_autoload) { 2807 warn_report("Autoload option is deprecated and its value is ignored"); 2808 } 2809 2810 if (!has_disabled) { 2811 disabled = false; 2812 } 2813 2814 if (persistent && 2815 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) 2816 { 2817 return; 2818 } 2819 2820 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2821 if (bitmap == NULL) { 2822 return; 2823 } 2824 2825 if (disabled) { 2826 bdrv_disable_dirty_bitmap(bitmap); 2827 } 2828 2829 bdrv_dirty_bitmap_set_persistance(bitmap, persistent); 2830 } 2831 2832 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2833 Error **errp) 2834 { 2835 BlockDriverState *bs; 2836 BdrvDirtyBitmap *bitmap; 2837 Error *local_err = NULL; 2838 2839 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2840 if (!bitmap || !bs) { 2841 return; 2842 } 2843 2844 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2845 error_setg(errp, 2846 "Bitmap '%s' is currently frozen and cannot be removed", 2847 name); 2848 return; 2849 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) { 2850 error_setg(errp, 2851 "Bitmap '%s' is currently locked and cannot be removed", 2852 name); 2853 return; 2854 } 2855 2856 if (bdrv_dirty_bitmap_get_persistance(bitmap)) { 2857 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2858 if (local_err != NULL) { 2859 error_propagate(errp, local_err); 2860 return; 2861 } 2862 } 2863 2864 bdrv_release_dirty_bitmap(bs, bitmap); 2865 } 2866 2867 /** 2868 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2869 * immediately after a full backup operation. 2870 */ 2871 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2872 Error **errp) 2873 { 2874 BdrvDirtyBitmap *bitmap; 2875 BlockDriverState *bs; 2876 2877 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2878 if (!bitmap || !bs) { 2879 return; 2880 } 2881 2882 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2883 error_setg(errp, 2884 "Bitmap '%s' is currently frozen and cannot be modified", 2885 name); 2886 return; 2887 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) { 2888 error_setg(errp, 2889 "Bitmap '%s' is currently locked and cannot be modified", 2890 name); 2891 return; 2892 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2893 error_setg(errp, 2894 "Bitmap '%s' is currently disabled and cannot be cleared", 2895 name); 2896 return; 2897 } else if (bdrv_dirty_bitmap_readonly(bitmap)) { 2898 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name); 2899 return; 2900 } 2901 2902 bdrv_clear_dirty_bitmap(bitmap, NULL); 2903 } 2904 2905 void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name, 2906 Error **errp) 2907 { 2908 BlockDriverState *bs; 2909 BdrvDirtyBitmap *bitmap; 2910 2911 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2912 if (!bitmap) { 2913 return; 2914 } 2915 2916 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2917 error_setg(errp, 2918 "Bitmap '%s' is currently frozen and cannot be enabled", 2919 name); 2920 return; 2921 } 2922 2923 bdrv_enable_dirty_bitmap(bitmap); 2924 } 2925 2926 void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name, 2927 Error **errp) 2928 { 2929 BlockDriverState *bs; 2930 BdrvDirtyBitmap *bitmap; 2931 2932 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2933 if (!bitmap) { 2934 return; 2935 } 2936 2937 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2938 error_setg(errp, 2939 "Bitmap '%s' is currently frozen and cannot be disabled", 2940 name); 2941 return; 2942 } 2943 2944 bdrv_disable_dirty_bitmap(bitmap); 2945 } 2946 2947 void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name, 2948 const char *src_name, Error **errp) 2949 { 2950 BlockDriverState *bs; 2951 BdrvDirtyBitmap *dst, *src; 2952 2953 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp); 2954 if (!dst) { 2955 return; 2956 } 2957 2958 if (bdrv_dirty_bitmap_frozen(dst)) { 2959 error_setg(errp, "Bitmap '%s' is frozen and cannot be modified", 2960 dst_name); 2961 return; 2962 } else if (bdrv_dirty_bitmap_readonly(dst)) { 2963 error_setg(errp, "Bitmap '%s' is readonly and cannot be modified", 2964 dst_name); 2965 return; 2966 } 2967 2968 src = bdrv_find_dirty_bitmap(bs, src_name); 2969 if (!src) { 2970 error_setg(errp, "Dirty bitmap '%s' not found", src_name); 2971 return; 2972 } 2973 2974 bdrv_merge_dirty_bitmap(dst, src, errp); 2975 } 2976 2977 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2978 const char *name, 2979 Error **errp) 2980 { 2981 BdrvDirtyBitmap *bitmap; 2982 BlockDriverState *bs; 2983 BlockDirtyBitmapSha256 *ret = NULL; 2984 char *sha256; 2985 2986 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2987 if (!bitmap || !bs) { 2988 return NULL; 2989 } 2990 2991 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2992 if (sha256 == NULL) { 2993 return NULL; 2994 } 2995 2996 ret = g_new(BlockDirtyBitmapSha256, 1); 2997 ret->sha256 = sha256; 2998 2999 return ret; 3000 } 3001 3002 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3003 { 3004 const char *id = qdict_get_str(qdict, "id"); 3005 BlockBackend *blk; 3006 BlockDriverState *bs; 3007 AioContext *aio_context; 3008 Error *local_err = NULL; 3009 3010 bs = bdrv_find_node(id); 3011 if (bs) { 3012 qmp_blockdev_del(id, &local_err); 3013 if (local_err) { 3014 error_report_err(local_err); 3015 } 3016 return; 3017 } 3018 3019 blk = blk_by_name(id); 3020 if (!blk) { 3021 error_report("Device '%s' not found", id); 3022 return; 3023 } 3024 3025 if (!blk_legacy_dinfo(blk)) { 3026 error_report("Deleting device added with blockdev-add" 3027 " is not supported"); 3028 return; 3029 } 3030 3031 aio_context = blk_get_aio_context(blk); 3032 aio_context_acquire(aio_context); 3033 3034 bs = blk_bs(blk); 3035 if (bs) { 3036 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3037 error_report_err(local_err); 3038 aio_context_release(aio_context); 3039 return; 3040 } 3041 3042 blk_remove_bs(blk); 3043 } 3044 3045 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3046 monitor_remove_blk(blk); 3047 3048 /* If this BlockBackend has a device attached to it, its refcount will be 3049 * decremented when the device is removed; otherwise we have to do so here. 3050 */ 3051 if (blk_get_attached_dev(blk)) { 3052 /* Further I/O must not pause the guest */ 3053 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3054 BLOCKDEV_ON_ERROR_REPORT); 3055 } else { 3056 blk_unref(blk); 3057 } 3058 3059 aio_context_release(aio_context); 3060 } 3061 3062 void qmp_block_resize(bool has_device, const char *device, 3063 bool has_node_name, const char *node_name, 3064 int64_t size, Error **errp) 3065 { 3066 Error *local_err = NULL; 3067 BlockBackend *blk = NULL; 3068 BlockDriverState *bs; 3069 AioContext *aio_context; 3070 int ret; 3071 3072 bs = bdrv_lookup_bs(has_device ? device : NULL, 3073 has_node_name ? node_name : NULL, 3074 &local_err); 3075 if (local_err) { 3076 error_propagate(errp, local_err); 3077 return; 3078 } 3079 3080 aio_context = bdrv_get_aio_context(bs); 3081 aio_context_acquire(aio_context); 3082 3083 if (!bdrv_is_first_non_filter(bs)) { 3084 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3085 goto out; 3086 } 3087 3088 if (size < 0) { 3089 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3090 goto out; 3091 } 3092 3093 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3094 error_setg(errp, QERR_DEVICE_IN_USE, device); 3095 goto out; 3096 } 3097 3098 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3099 ret = blk_insert_bs(blk, bs, errp); 3100 if (ret < 0) { 3101 goto out; 3102 } 3103 3104 bdrv_drained_begin(bs); 3105 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3106 bdrv_drained_end(bs); 3107 3108 out: 3109 blk_unref(blk); 3110 aio_context_release(aio_context); 3111 } 3112 3113 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3114 bool has_base, const char *base, 3115 bool has_base_node, const char *base_node, 3116 bool has_backing_file, const char *backing_file, 3117 bool has_speed, int64_t speed, 3118 bool has_on_error, BlockdevOnError on_error, 3119 Error **errp) 3120 { 3121 BlockDriverState *bs, *iter; 3122 BlockDriverState *base_bs = NULL; 3123 AioContext *aio_context; 3124 Error *local_err = NULL; 3125 const char *base_name = NULL; 3126 3127 if (!has_on_error) { 3128 on_error = BLOCKDEV_ON_ERROR_REPORT; 3129 } 3130 3131 bs = bdrv_lookup_bs(device, device, errp); 3132 if (!bs) { 3133 return; 3134 } 3135 3136 aio_context = bdrv_get_aio_context(bs); 3137 aio_context_acquire(aio_context); 3138 3139 if (has_base && has_base_node) { 3140 error_setg(errp, "'base' and 'base-node' cannot be specified " 3141 "at the same time"); 3142 goto out; 3143 } 3144 3145 if (has_base) { 3146 base_bs = bdrv_find_backing_image(bs, base); 3147 if (base_bs == NULL) { 3148 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3149 goto out; 3150 } 3151 assert(bdrv_get_aio_context(base_bs) == aio_context); 3152 base_name = base; 3153 } 3154 3155 if (has_base_node) { 3156 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3157 if (!base_bs) { 3158 goto out; 3159 } 3160 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3161 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3162 base_node, device); 3163 goto out; 3164 } 3165 assert(bdrv_get_aio_context(base_bs) == aio_context); 3166 base_name = base_bs->filename; 3167 } 3168 3169 /* Check for op blockers in the whole chain between bs and base */ 3170 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3171 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3172 goto out; 3173 } 3174 } 3175 3176 /* if we are streaming the entire chain, the result will have no backing 3177 * file, and specifying one is therefore an error */ 3178 if (base_bs == NULL && has_backing_file) { 3179 error_setg(errp, "backing file specified, but streaming the " 3180 "entire chain"); 3181 goto out; 3182 } 3183 3184 /* backing_file string overrides base bs filename */ 3185 base_name = has_backing_file ? backing_file : base_name; 3186 3187 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3188 has_speed ? speed : 0, on_error, &local_err); 3189 if (local_err) { 3190 error_propagate(errp, local_err); 3191 goto out; 3192 } 3193 3194 trace_qmp_block_stream(bs, bs->job); 3195 3196 out: 3197 aio_context_release(aio_context); 3198 } 3199 3200 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3201 bool has_base, const char *base, 3202 bool has_top, const char *top, 3203 bool has_backing_file, const char *backing_file, 3204 bool has_speed, int64_t speed, 3205 bool has_filter_node_name, const char *filter_node_name, 3206 Error **errp) 3207 { 3208 BlockDriverState *bs; 3209 BlockDriverState *iter; 3210 BlockDriverState *base_bs, *top_bs; 3211 AioContext *aio_context; 3212 Error *local_err = NULL; 3213 /* This will be part of the QMP command, if/when the 3214 * BlockdevOnError change for blkmirror makes it in 3215 */ 3216 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3217 3218 if (!has_speed) { 3219 speed = 0; 3220 } 3221 if (!has_filter_node_name) { 3222 filter_node_name = NULL; 3223 } 3224 3225 /* Important Note: 3226 * libvirt relies on the DeviceNotFound error class in order to probe for 3227 * live commit feature versions; for this to work, we must make sure to 3228 * perform the device lookup before any generic errors that may occur in a 3229 * scenario in which all optional arguments are omitted. */ 3230 bs = qmp_get_root_bs(device, &local_err); 3231 if (!bs) { 3232 bs = bdrv_lookup_bs(device, device, NULL); 3233 if (!bs) { 3234 error_free(local_err); 3235 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3236 "Device '%s' not found", device); 3237 } else { 3238 error_propagate(errp, local_err); 3239 } 3240 return; 3241 } 3242 3243 aio_context = bdrv_get_aio_context(bs); 3244 aio_context_acquire(aio_context); 3245 3246 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3247 goto out; 3248 } 3249 3250 /* default top_bs is the active layer */ 3251 top_bs = bs; 3252 3253 if (has_top && top) { 3254 if (strcmp(bs->filename, top) != 0) { 3255 top_bs = bdrv_find_backing_image(bs, top); 3256 } 3257 } 3258 3259 if (top_bs == NULL) { 3260 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3261 goto out; 3262 } 3263 3264 assert(bdrv_get_aio_context(top_bs) == aio_context); 3265 3266 if (has_base && base) { 3267 base_bs = bdrv_find_backing_image(top_bs, base); 3268 } else { 3269 base_bs = bdrv_find_base(top_bs); 3270 } 3271 3272 if (base_bs == NULL) { 3273 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3274 goto out; 3275 } 3276 3277 assert(bdrv_get_aio_context(base_bs) == aio_context); 3278 3279 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3280 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3281 goto out; 3282 } 3283 } 3284 3285 /* Do not allow attempts to commit an image into itself */ 3286 if (top_bs == base_bs) { 3287 error_setg(errp, "cannot commit an image into itself"); 3288 goto out; 3289 } 3290 3291 if (top_bs == bs) { 3292 if (has_backing_file) { 3293 error_setg(errp, "'backing-file' specified," 3294 " but 'top' is the active layer"); 3295 goto out; 3296 } 3297 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3298 JOB_DEFAULT, speed, on_error, 3299 filter_node_name, NULL, NULL, false, &local_err); 3300 } else { 3301 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3302 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3303 goto out; 3304 } 3305 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed, 3306 on_error, has_backing_file ? backing_file : NULL, 3307 filter_node_name, &local_err); 3308 } 3309 if (local_err != NULL) { 3310 error_propagate(errp, local_err); 3311 goto out; 3312 } 3313 3314 out: 3315 aio_context_release(aio_context); 3316 } 3317 3318 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3319 Error **errp) 3320 { 3321 BlockDriverState *bs; 3322 BlockDriverState *target_bs; 3323 BlockDriverState *source = NULL; 3324 BlockJob *job = NULL; 3325 BdrvDirtyBitmap *bmap = NULL; 3326 AioContext *aio_context; 3327 QDict *options = NULL; 3328 Error *local_err = NULL; 3329 int flags, job_flags = JOB_DEFAULT; 3330 int64_t size; 3331 bool set_backing_hd = false; 3332 3333 if (!backup->has_speed) { 3334 backup->speed = 0; 3335 } 3336 if (!backup->has_on_source_error) { 3337 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3338 } 3339 if (!backup->has_on_target_error) { 3340 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3341 } 3342 if (!backup->has_mode) { 3343 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3344 } 3345 if (!backup->has_job_id) { 3346 backup->job_id = NULL; 3347 } 3348 if (!backup->has_auto_finalize) { 3349 backup->auto_finalize = true; 3350 } 3351 if (!backup->has_auto_dismiss) { 3352 backup->auto_dismiss = true; 3353 } 3354 if (!backup->has_compress) { 3355 backup->compress = false; 3356 } 3357 3358 bs = qmp_get_root_bs(backup->device, errp); 3359 if (!bs) { 3360 return NULL; 3361 } 3362 3363 aio_context = bdrv_get_aio_context(bs); 3364 aio_context_acquire(aio_context); 3365 3366 if (!backup->has_format) { 3367 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3368 NULL : (char*) bs->drv->format_name; 3369 } 3370 3371 /* Early check to avoid creating target */ 3372 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3373 goto out; 3374 } 3375 3376 flags = bs->open_flags | BDRV_O_RDWR; 3377 3378 /* See if we have a backing HD we can use to create our new image 3379 * on top of. */ 3380 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3381 source = backing_bs(bs); 3382 if (!source) { 3383 backup->sync = MIRROR_SYNC_MODE_FULL; 3384 } 3385 } 3386 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3387 source = bs; 3388 flags |= BDRV_O_NO_BACKING; 3389 set_backing_hd = true; 3390 } 3391 3392 size = bdrv_getlength(bs); 3393 if (size < 0) { 3394 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3395 goto out; 3396 } 3397 3398 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3399 assert(backup->format); 3400 if (source) { 3401 bdrv_img_create(backup->target, backup->format, source->filename, 3402 source->drv->format_name, NULL, 3403 size, flags, false, &local_err); 3404 } else { 3405 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3406 size, flags, false, &local_err); 3407 } 3408 } 3409 3410 if (local_err) { 3411 error_propagate(errp, local_err); 3412 goto out; 3413 } 3414 3415 if (backup->format) { 3416 if (!options) { 3417 options = qdict_new(); 3418 } 3419 qdict_put_str(options, "driver", backup->format); 3420 } 3421 3422 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3423 if (!target_bs) { 3424 goto out; 3425 } 3426 3427 bdrv_set_aio_context(target_bs, aio_context); 3428 3429 if (set_backing_hd) { 3430 bdrv_set_backing_hd(target_bs, source, &local_err); 3431 if (local_err) { 3432 bdrv_unref(target_bs); 3433 goto out; 3434 } 3435 } 3436 3437 if (backup->has_bitmap) { 3438 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3439 if (!bmap) { 3440 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3441 bdrv_unref(target_bs); 3442 goto out; 3443 } 3444 if (bdrv_dirty_bitmap_qmp_locked(bmap)) { 3445 error_setg(errp, 3446 "Bitmap '%s' is currently locked and cannot be used for " 3447 "backup", backup->bitmap); 3448 goto out; 3449 } 3450 } 3451 if (!backup->auto_finalize) { 3452 job_flags |= JOB_MANUAL_FINALIZE; 3453 } 3454 if (!backup->auto_dismiss) { 3455 job_flags |= JOB_MANUAL_DISMISS; 3456 } 3457 3458 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3459 backup->sync, bmap, backup->compress, 3460 backup->on_source_error, backup->on_target_error, 3461 job_flags, NULL, NULL, txn, &local_err); 3462 bdrv_unref(target_bs); 3463 if (local_err != NULL) { 3464 error_propagate(errp, local_err); 3465 goto out; 3466 } 3467 3468 out: 3469 aio_context_release(aio_context); 3470 return job; 3471 } 3472 3473 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3474 { 3475 3476 BlockJob *job; 3477 job = do_drive_backup(arg, NULL, errp); 3478 if (job) { 3479 job_start(&job->job); 3480 } 3481 } 3482 3483 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3484 { 3485 return bdrv_named_nodes_list(errp); 3486 } 3487 3488 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3489 Error **errp) 3490 { 3491 BlockDriverState *bs; 3492 BlockDriverState *target_bs; 3493 Error *local_err = NULL; 3494 AioContext *aio_context; 3495 BlockJob *job = NULL; 3496 int job_flags = JOB_DEFAULT; 3497 3498 if (!backup->has_speed) { 3499 backup->speed = 0; 3500 } 3501 if (!backup->has_on_source_error) { 3502 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3503 } 3504 if (!backup->has_on_target_error) { 3505 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3506 } 3507 if (!backup->has_job_id) { 3508 backup->job_id = NULL; 3509 } 3510 if (!backup->has_auto_finalize) { 3511 backup->auto_finalize = true; 3512 } 3513 if (!backup->has_auto_dismiss) { 3514 backup->auto_dismiss = true; 3515 } 3516 if (!backup->has_compress) { 3517 backup->compress = false; 3518 } 3519 3520 bs = qmp_get_root_bs(backup->device, errp); 3521 if (!bs) { 3522 return NULL; 3523 } 3524 3525 aio_context = bdrv_get_aio_context(bs); 3526 aio_context_acquire(aio_context); 3527 3528 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3529 if (!target_bs) { 3530 goto out; 3531 } 3532 3533 if (bdrv_get_aio_context(target_bs) != aio_context) { 3534 if (!bdrv_has_blk(target_bs)) { 3535 /* The target BDS is not attached, we can safely move it to another 3536 * AioContext. */ 3537 bdrv_set_aio_context(target_bs, aio_context); 3538 } else { 3539 error_setg(errp, "Target is attached to a different thread from " 3540 "source."); 3541 goto out; 3542 } 3543 } 3544 if (!backup->auto_finalize) { 3545 job_flags |= JOB_MANUAL_FINALIZE; 3546 } 3547 if (!backup->auto_dismiss) { 3548 job_flags |= JOB_MANUAL_DISMISS; 3549 } 3550 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3551 backup->sync, NULL, backup->compress, 3552 backup->on_source_error, backup->on_target_error, 3553 job_flags, NULL, NULL, txn, &local_err); 3554 if (local_err != NULL) { 3555 error_propagate(errp, local_err); 3556 } 3557 out: 3558 aio_context_release(aio_context); 3559 return job; 3560 } 3561 3562 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3563 { 3564 BlockJob *job; 3565 job = do_blockdev_backup(arg, NULL, errp); 3566 if (job) { 3567 job_start(&job->job); 3568 } 3569 } 3570 3571 /* Parameter check and block job starting for drive mirroring. 3572 * Caller should hold @device and @target's aio context (must be the same). 3573 **/ 3574 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3575 BlockDriverState *target, 3576 bool has_replaces, const char *replaces, 3577 enum MirrorSyncMode sync, 3578 BlockMirrorBackingMode backing_mode, 3579 bool has_speed, int64_t speed, 3580 bool has_granularity, uint32_t granularity, 3581 bool has_buf_size, int64_t buf_size, 3582 bool has_on_source_error, 3583 BlockdevOnError on_source_error, 3584 bool has_on_target_error, 3585 BlockdevOnError on_target_error, 3586 bool has_unmap, bool unmap, 3587 bool has_filter_node_name, 3588 const char *filter_node_name, 3589 bool has_copy_mode, MirrorCopyMode copy_mode, 3590 Error **errp) 3591 { 3592 3593 if (!has_speed) { 3594 speed = 0; 3595 } 3596 if (!has_on_source_error) { 3597 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3598 } 3599 if (!has_on_target_error) { 3600 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3601 } 3602 if (!has_granularity) { 3603 granularity = 0; 3604 } 3605 if (!has_buf_size) { 3606 buf_size = 0; 3607 } 3608 if (!has_unmap) { 3609 unmap = true; 3610 } 3611 if (!has_filter_node_name) { 3612 filter_node_name = NULL; 3613 } 3614 if (!has_copy_mode) { 3615 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3616 } 3617 3618 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3619 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3620 "a value in range [512B, 64MB]"); 3621 return; 3622 } 3623 if (granularity & (granularity - 1)) { 3624 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3625 "power of 2"); 3626 return; 3627 } 3628 3629 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3630 return; 3631 } 3632 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3633 return; 3634 } 3635 3636 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3637 sync = MIRROR_SYNC_MODE_FULL; 3638 } 3639 3640 /* pass the node name to replace to mirror start since it's loose coupling 3641 * and will allow to check whether the node still exist at mirror completion 3642 */ 3643 mirror_start(job_id, bs, target, 3644 has_replaces ? replaces : NULL, 3645 speed, granularity, buf_size, sync, backing_mode, 3646 on_source_error, on_target_error, unmap, filter_node_name, 3647 copy_mode, errp); 3648 } 3649 3650 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3651 { 3652 BlockDriverState *bs; 3653 BlockDriverState *source, *target_bs; 3654 AioContext *aio_context; 3655 BlockMirrorBackingMode backing_mode; 3656 Error *local_err = NULL; 3657 QDict *options = NULL; 3658 int flags; 3659 int64_t size; 3660 const char *format = arg->format; 3661 3662 bs = qmp_get_root_bs(arg->device, errp); 3663 if (!bs) { 3664 return; 3665 } 3666 3667 /* Early check to avoid creating target */ 3668 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3669 return; 3670 } 3671 3672 aio_context = bdrv_get_aio_context(bs); 3673 aio_context_acquire(aio_context); 3674 3675 if (!arg->has_mode) { 3676 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3677 } 3678 3679 if (!arg->has_format) { 3680 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3681 ? NULL : bs->drv->format_name); 3682 } 3683 3684 flags = bs->open_flags | BDRV_O_RDWR; 3685 source = backing_bs(bs); 3686 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3687 arg->sync = MIRROR_SYNC_MODE_FULL; 3688 } 3689 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3690 source = bs; 3691 } 3692 3693 size = bdrv_getlength(bs); 3694 if (size < 0) { 3695 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3696 goto out; 3697 } 3698 3699 if (arg->has_replaces) { 3700 BlockDriverState *to_replace_bs; 3701 AioContext *replace_aio_context; 3702 int64_t replace_size; 3703 3704 if (!arg->has_node_name) { 3705 error_setg(errp, "a node-name must be provided when replacing a" 3706 " named node of the graph"); 3707 goto out; 3708 } 3709 3710 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err); 3711 3712 if (!to_replace_bs) { 3713 error_propagate(errp, local_err); 3714 goto out; 3715 } 3716 3717 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3718 aio_context_acquire(replace_aio_context); 3719 replace_size = bdrv_getlength(to_replace_bs); 3720 aio_context_release(replace_aio_context); 3721 3722 if (size != replace_size) { 3723 error_setg(errp, "cannot replace image with a mirror image of " 3724 "different size"); 3725 goto out; 3726 } 3727 } 3728 3729 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3730 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3731 } else { 3732 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3733 } 3734 3735 /* Don't open backing image in create() */ 3736 flags |= BDRV_O_NO_BACKING; 3737 3738 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3739 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3740 { 3741 /* create new image w/o backing file */ 3742 assert(format); 3743 bdrv_img_create(arg->target, format, 3744 NULL, NULL, NULL, size, flags, false, &local_err); 3745 } else { 3746 switch (arg->mode) { 3747 case NEW_IMAGE_MODE_EXISTING: 3748 break; 3749 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3750 /* create new image with backing file */ 3751 bdrv_img_create(arg->target, format, 3752 source->filename, 3753 source->drv->format_name, 3754 NULL, size, flags, false, &local_err); 3755 break; 3756 default: 3757 abort(); 3758 } 3759 } 3760 3761 if (local_err) { 3762 error_propagate(errp, local_err); 3763 goto out; 3764 } 3765 3766 options = qdict_new(); 3767 if (arg->has_node_name) { 3768 qdict_put_str(options, "node-name", arg->node_name); 3769 } 3770 if (format) { 3771 qdict_put_str(options, "driver", format); 3772 } 3773 3774 /* Mirroring takes care of copy-on-write using the source's backing 3775 * file. 3776 */ 3777 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3778 if (!target_bs) { 3779 goto out; 3780 } 3781 3782 bdrv_set_aio_context(target_bs, aio_context); 3783 3784 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3785 arg->has_replaces, arg->replaces, arg->sync, 3786 backing_mode, arg->has_speed, arg->speed, 3787 arg->has_granularity, arg->granularity, 3788 arg->has_buf_size, arg->buf_size, 3789 arg->has_on_source_error, arg->on_source_error, 3790 arg->has_on_target_error, arg->on_target_error, 3791 arg->has_unmap, arg->unmap, 3792 false, NULL, 3793 arg->has_copy_mode, arg->copy_mode, 3794 &local_err); 3795 bdrv_unref(target_bs); 3796 error_propagate(errp, local_err); 3797 out: 3798 aio_context_release(aio_context); 3799 } 3800 3801 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3802 const char *device, const char *target, 3803 bool has_replaces, const char *replaces, 3804 MirrorSyncMode sync, 3805 bool has_speed, int64_t speed, 3806 bool has_granularity, uint32_t granularity, 3807 bool has_buf_size, int64_t buf_size, 3808 bool has_on_source_error, 3809 BlockdevOnError on_source_error, 3810 bool has_on_target_error, 3811 BlockdevOnError on_target_error, 3812 bool has_filter_node_name, 3813 const char *filter_node_name, 3814 bool has_copy_mode, MirrorCopyMode copy_mode, 3815 Error **errp) 3816 { 3817 BlockDriverState *bs; 3818 BlockDriverState *target_bs; 3819 AioContext *aio_context; 3820 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3821 Error *local_err = NULL; 3822 3823 bs = qmp_get_root_bs(device, errp); 3824 if (!bs) { 3825 return; 3826 } 3827 3828 target_bs = bdrv_lookup_bs(target, target, errp); 3829 if (!target_bs) { 3830 return; 3831 } 3832 3833 aio_context = bdrv_get_aio_context(bs); 3834 aio_context_acquire(aio_context); 3835 3836 bdrv_set_aio_context(target_bs, aio_context); 3837 3838 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3839 has_replaces, replaces, sync, backing_mode, 3840 has_speed, speed, 3841 has_granularity, granularity, 3842 has_buf_size, buf_size, 3843 has_on_source_error, on_source_error, 3844 has_on_target_error, on_target_error, 3845 true, true, 3846 has_filter_node_name, filter_node_name, 3847 has_copy_mode, copy_mode, 3848 &local_err); 3849 error_propagate(errp, local_err); 3850 3851 aio_context_release(aio_context); 3852 } 3853 3854 /* Get a block job using its ID and acquire its AioContext */ 3855 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3856 Error **errp) 3857 { 3858 BlockJob *job; 3859 3860 assert(id != NULL); 3861 3862 *aio_context = NULL; 3863 3864 job = block_job_get(id); 3865 3866 if (!job) { 3867 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3868 "Block job '%s' not found", id); 3869 return NULL; 3870 } 3871 3872 *aio_context = blk_get_aio_context(job->blk); 3873 aio_context_acquire(*aio_context); 3874 3875 return job; 3876 } 3877 3878 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3879 { 3880 AioContext *aio_context; 3881 BlockJob *job = find_block_job(device, &aio_context, errp); 3882 3883 if (!job) { 3884 return; 3885 } 3886 3887 block_job_set_speed(job, speed, errp); 3888 aio_context_release(aio_context); 3889 } 3890 3891 void qmp_block_job_cancel(const char *device, 3892 bool has_force, bool force, Error **errp) 3893 { 3894 AioContext *aio_context; 3895 BlockJob *job = find_block_job(device, &aio_context, errp); 3896 3897 if (!job) { 3898 return; 3899 } 3900 3901 if (!has_force) { 3902 force = false; 3903 } 3904 3905 if (job_user_paused(&job->job) && !force) { 3906 error_setg(errp, "The block job for device '%s' is currently paused", 3907 device); 3908 goto out; 3909 } 3910 3911 trace_qmp_block_job_cancel(job); 3912 job_user_cancel(&job->job, force, errp); 3913 out: 3914 aio_context_release(aio_context); 3915 } 3916 3917 void qmp_block_job_pause(const char *device, Error **errp) 3918 { 3919 AioContext *aio_context; 3920 BlockJob *job = find_block_job(device, &aio_context, errp); 3921 3922 if (!job) { 3923 return; 3924 } 3925 3926 trace_qmp_block_job_pause(job); 3927 job_user_pause(&job->job, errp); 3928 aio_context_release(aio_context); 3929 } 3930 3931 void qmp_block_job_resume(const char *device, Error **errp) 3932 { 3933 AioContext *aio_context; 3934 BlockJob *job = find_block_job(device, &aio_context, errp); 3935 3936 if (!job) { 3937 return; 3938 } 3939 3940 trace_qmp_block_job_resume(job); 3941 job_user_resume(&job->job, errp); 3942 aio_context_release(aio_context); 3943 } 3944 3945 void qmp_block_job_complete(const char *device, Error **errp) 3946 { 3947 AioContext *aio_context; 3948 BlockJob *job = find_block_job(device, &aio_context, errp); 3949 3950 if (!job) { 3951 return; 3952 } 3953 3954 trace_qmp_block_job_complete(job); 3955 job_complete(&job->job, errp); 3956 aio_context_release(aio_context); 3957 } 3958 3959 void qmp_block_job_finalize(const char *id, Error **errp) 3960 { 3961 AioContext *aio_context; 3962 BlockJob *job = find_block_job(id, &aio_context, errp); 3963 3964 if (!job) { 3965 return; 3966 } 3967 3968 trace_qmp_block_job_finalize(job); 3969 job_finalize(&job->job, errp); 3970 aio_context_release(aio_context); 3971 } 3972 3973 void qmp_block_job_dismiss(const char *id, Error **errp) 3974 { 3975 AioContext *aio_context; 3976 BlockJob *bjob = find_block_job(id, &aio_context, errp); 3977 Job *job; 3978 3979 if (!bjob) { 3980 return; 3981 } 3982 3983 trace_qmp_block_job_dismiss(bjob); 3984 job = &bjob->job; 3985 job_dismiss(&job, errp); 3986 aio_context_release(aio_context); 3987 } 3988 3989 void qmp_change_backing_file(const char *device, 3990 const char *image_node_name, 3991 const char *backing_file, 3992 Error **errp) 3993 { 3994 BlockDriverState *bs = NULL; 3995 AioContext *aio_context; 3996 BlockDriverState *image_bs = NULL; 3997 Error *local_err = NULL; 3998 bool ro; 3999 int open_flags; 4000 int ret; 4001 4002 bs = qmp_get_root_bs(device, errp); 4003 if (!bs) { 4004 return; 4005 } 4006 4007 aio_context = bdrv_get_aio_context(bs); 4008 aio_context_acquire(aio_context); 4009 4010 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4011 if (local_err) { 4012 error_propagate(errp, local_err); 4013 goto out; 4014 } 4015 4016 if (!image_bs) { 4017 error_setg(errp, "image file not found"); 4018 goto out; 4019 } 4020 4021 if (bdrv_find_base(image_bs) == image_bs) { 4022 error_setg(errp, "not allowing backing file change on an image " 4023 "without a backing file"); 4024 goto out; 4025 } 4026 4027 /* even though we are not necessarily operating on bs, we need it to 4028 * determine if block ops are currently prohibited on the chain */ 4029 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4030 goto out; 4031 } 4032 4033 /* final sanity check */ 4034 if (!bdrv_chain_contains(bs, image_bs)) { 4035 error_setg(errp, "'%s' and image file are not in the same chain", 4036 device); 4037 goto out; 4038 } 4039 4040 /* if not r/w, reopen to make r/w */ 4041 open_flags = image_bs->open_flags; 4042 ro = bdrv_is_read_only(image_bs); 4043 4044 if (ro) { 4045 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 4046 if (local_err) { 4047 error_propagate(errp, local_err); 4048 goto out; 4049 } 4050 } 4051 4052 ret = bdrv_change_backing_file(image_bs, backing_file, 4053 image_bs->drv ? image_bs->drv->format_name : ""); 4054 4055 if (ret < 0) { 4056 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4057 backing_file); 4058 /* don't exit here, so we can try to restore open flags if 4059 * appropriate */ 4060 } 4061 4062 if (ro) { 4063 bdrv_reopen(image_bs, open_flags, &local_err); 4064 error_propagate(errp, local_err); 4065 } 4066 4067 out: 4068 aio_context_release(aio_context); 4069 } 4070 4071 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4072 { 4073 QemuOpts *opts; 4074 QDict *qdict; 4075 Error *local_err = NULL; 4076 4077 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4078 if (!opts) { 4079 return; 4080 } 4081 4082 qdict = qemu_opts_to_qdict(opts, NULL); 4083 4084 if (!qdict_get_try_str(qdict, "node-name")) { 4085 qobject_unref(qdict); 4086 error_report("'node-name' needs to be specified"); 4087 goto out; 4088 } 4089 4090 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4091 if (!bs) { 4092 error_report_err(local_err); 4093 goto out; 4094 } 4095 4096 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4097 4098 out: 4099 qemu_opts_del(opts); 4100 } 4101 4102 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4103 { 4104 BlockDriverState *bs; 4105 QObject *obj; 4106 Visitor *v = qobject_output_visitor_new(&obj); 4107 QDict *qdict; 4108 Error *local_err = NULL; 4109 4110 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4111 if (local_err) { 4112 error_propagate(errp, local_err); 4113 goto fail; 4114 } 4115 4116 visit_complete(v, &obj); 4117 qdict = qobject_to(QDict, obj); 4118 4119 qdict_flatten(qdict); 4120 4121 if (!qdict_get_try_str(qdict, "node-name")) { 4122 error_setg(errp, "'node-name' must be specified for the root node"); 4123 goto fail; 4124 } 4125 4126 bs = bds_tree_init(qdict, errp); 4127 if (!bs) { 4128 goto fail; 4129 } 4130 4131 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4132 4133 fail: 4134 visit_free(v); 4135 } 4136 4137 void qmp_blockdev_del(const char *node_name, Error **errp) 4138 { 4139 AioContext *aio_context; 4140 BlockDriverState *bs; 4141 4142 bs = bdrv_find_node(node_name); 4143 if (!bs) { 4144 error_setg(errp, "Cannot find node %s", node_name); 4145 return; 4146 } 4147 if (bdrv_has_blk(bs)) { 4148 error_setg(errp, "Node %s is in use", node_name); 4149 return; 4150 } 4151 aio_context = bdrv_get_aio_context(bs); 4152 aio_context_acquire(aio_context); 4153 4154 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4155 goto out; 4156 } 4157 4158 if (!bs->monitor_list.tqe_prev) { 4159 error_setg(errp, "Node %s is not owned by the monitor", 4160 bs->node_name); 4161 goto out; 4162 } 4163 4164 if (bs->refcnt > 1) { 4165 error_setg(errp, "Block device %s is in use", 4166 bdrv_get_device_or_node_name(bs)); 4167 goto out; 4168 } 4169 4170 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4171 bdrv_unref(bs); 4172 4173 out: 4174 aio_context_release(aio_context); 4175 } 4176 4177 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4178 const char *child_name) 4179 { 4180 BdrvChild *child; 4181 4182 QLIST_FOREACH(child, &parent_bs->children, next) { 4183 if (strcmp(child->name, child_name) == 0) { 4184 return child; 4185 } 4186 } 4187 4188 return NULL; 4189 } 4190 4191 void qmp_x_blockdev_change(const char *parent, bool has_child, 4192 const char *child, bool has_node, 4193 const char *node, Error **errp) 4194 { 4195 BlockDriverState *parent_bs, *new_bs = NULL; 4196 BdrvChild *p_child; 4197 4198 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4199 if (!parent_bs) { 4200 return; 4201 } 4202 4203 if (has_child == has_node) { 4204 if (has_child) { 4205 error_setg(errp, "The parameters child and node are in conflict"); 4206 } else { 4207 error_setg(errp, "Either child or node must be specified"); 4208 } 4209 return; 4210 } 4211 4212 if (has_child) { 4213 p_child = bdrv_find_child(parent_bs, child); 4214 if (!p_child) { 4215 error_setg(errp, "Node '%s' does not have child '%s'", 4216 parent, child); 4217 return; 4218 } 4219 bdrv_del_child(parent_bs, p_child, errp); 4220 } 4221 4222 if (has_node) { 4223 new_bs = bdrv_find_node(node); 4224 if (!new_bs) { 4225 error_setg(errp, "Node '%s' not found", node); 4226 return; 4227 } 4228 bdrv_add_child(parent_bs, new_bs, errp); 4229 } 4230 } 4231 4232 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4233 { 4234 BlockJobInfoList *head = NULL, **p_next = &head; 4235 BlockJob *job; 4236 4237 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4238 BlockJobInfoList *elem; 4239 AioContext *aio_context; 4240 4241 if (block_job_is_internal(job)) { 4242 continue; 4243 } 4244 elem = g_new0(BlockJobInfoList, 1); 4245 aio_context = blk_get_aio_context(job->blk); 4246 aio_context_acquire(aio_context); 4247 elem->value = block_job_query(job, errp); 4248 aio_context_release(aio_context); 4249 if (!elem->value) { 4250 g_free(elem); 4251 qapi_free_BlockJobInfoList(head); 4252 return NULL; 4253 } 4254 *p_next = elem; 4255 p_next = &elem->next; 4256 } 4257 4258 return head; 4259 } 4260 4261 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4262 bool has_force, bool force, Error **errp) 4263 { 4264 AioContext *old_context; 4265 AioContext *new_context; 4266 BlockDriverState *bs; 4267 4268 bs = bdrv_find_node(node_name); 4269 if (!bs) { 4270 error_setg(errp, "Cannot find node %s", node_name); 4271 return; 4272 } 4273 4274 /* Protects against accidents. */ 4275 if (!(has_force && force) && bdrv_has_blk(bs)) { 4276 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4277 "be in use (use force=true to override this check)", 4278 node_name); 4279 return; 4280 } 4281 4282 if (iothread->type == QTYPE_QSTRING) { 4283 IOThread *obj = iothread_by_id(iothread->u.s); 4284 if (!obj) { 4285 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4286 return; 4287 } 4288 4289 new_context = iothread_get_aio_context(obj); 4290 } else { 4291 new_context = qemu_get_aio_context(); 4292 } 4293 4294 old_context = bdrv_get_aio_context(bs); 4295 aio_context_acquire(old_context); 4296 4297 bdrv_set_aio_context(bs, new_context); 4298 4299 aio_context_release(old_context); 4300 } 4301 4302 void qmp_x_block_latency_histogram_set( 4303 const char *device, 4304 bool has_boundaries, uint64List *boundaries, 4305 bool has_boundaries_read, uint64List *boundaries_read, 4306 bool has_boundaries_write, uint64List *boundaries_write, 4307 bool has_boundaries_flush, uint64List *boundaries_flush, 4308 Error **errp) 4309 { 4310 BlockBackend *blk = blk_by_name(device); 4311 BlockAcctStats *stats; 4312 4313 if (!blk) { 4314 error_setg(errp, "Device '%s' not found", device); 4315 return; 4316 } 4317 stats = blk_get_stats(blk); 4318 4319 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4320 !has_boundaries_flush) 4321 { 4322 block_latency_histograms_clear(stats); 4323 return; 4324 } 4325 4326 if (has_boundaries || has_boundaries_read) { 4327 block_latency_histogram_set( 4328 stats, BLOCK_ACCT_READ, 4329 has_boundaries_read ? boundaries_read : boundaries); 4330 } 4331 4332 if (has_boundaries || has_boundaries_write) { 4333 block_latency_histogram_set( 4334 stats, BLOCK_ACCT_WRITE, 4335 has_boundaries_write ? boundaries_write : boundaries); 4336 } 4337 4338 if (has_boundaries || has_boundaries_flush) { 4339 block_latency_histogram_set( 4340 stats, BLOCK_ACCT_FLUSH, 4341 has_boundaries_flush ? boundaries_flush : boundaries); 4342 } 4343 } 4344 4345 QemuOptsList qemu_common_drive_opts = { 4346 .name = "drive", 4347 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4348 .desc = { 4349 { 4350 .name = "snapshot", 4351 .type = QEMU_OPT_BOOL, 4352 .help = "enable/disable snapshot mode", 4353 },{ 4354 .name = "aio", 4355 .type = QEMU_OPT_STRING, 4356 .help = "host AIO implementation (threads, native)", 4357 },{ 4358 .name = BDRV_OPT_CACHE_WB, 4359 .type = QEMU_OPT_BOOL, 4360 .help = "Enable writeback mode", 4361 },{ 4362 .name = "format", 4363 .type = QEMU_OPT_STRING, 4364 .help = "disk format (raw, qcow2, ...)", 4365 },{ 4366 .name = "rerror", 4367 .type = QEMU_OPT_STRING, 4368 .help = "read error action", 4369 },{ 4370 .name = "werror", 4371 .type = QEMU_OPT_STRING, 4372 .help = "write error action", 4373 },{ 4374 .name = BDRV_OPT_READ_ONLY, 4375 .type = QEMU_OPT_BOOL, 4376 .help = "open drive file as read-only", 4377 }, 4378 4379 THROTTLE_OPTS, 4380 4381 { 4382 .name = "throttling.group", 4383 .type = QEMU_OPT_STRING, 4384 .help = "name of the block throttling group", 4385 },{ 4386 .name = "copy-on-read", 4387 .type = QEMU_OPT_BOOL, 4388 .help = "copy read data from backing file into image file", 4389 },{ 4390 .name = "detect-zeroes", 4391 .type = QEMU_OPT_STRING, 4392 .help = "try to optimize zero writes (off, on, unmap)", 4393 },{ 4394 .name = "stats-account-invalid", 4395 .type = QEMU_OPT_BOOL, 4396 .help = "whether to account for invalid I/O operations " 4397 "in the statistics", 4398 },{ 4399 .name = "stats-account-failed", 4400 .type = QEMU_OPT_BOOL, 4401 .help = "whether to account for failed I/O operations " 4402 "in the statistics", 4403 }, 4404 { /* end of list */ } 4405 }, 4406 }; 4407 4408 QemuOptsList qemu_drive_opts = { 4409 .name = "drive", 4410 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4411 .desc = { 4412 /* 4413 * no elements => accept any params 4414 * validation will happen later 4415 */ 4416 { /* end of list */ } 4417 }, 4418 }; 4419